This is just my list of things I think need to be patched. Feel free to comment.
*edited to reflect 1.16 patch and things that I thought were broken but weren't
*
1. Give us multiplayer in a patch. Civ2 is an old game in it's first incarnation. It's understandable that multiplayer was released in a seperate version for retail sale. It's almost 2002 at the time this game was released. It really should have had a multiplayer option. Please don't make us buy your game twice to get multiplayer.
2. Increase transport capacity for Aircraft Carriers. This isn't that big of a deal, but it sure seems like I should be able to put more than 4 planes on an aircraft carrier. Maybe an upgraded (nuclear-class) carrier with increased carrying capacity is in order.
3. Consider checking again the combat formula when units of different ages engage in combat. One of the things I remember reading in some Civ3 preview or another was something along the lines of "no longer will a single fortified pikeman on a mountain tile be able to defeat hordes of enemy tanks." While the terrain bonus does seem to have been scaled down from Civ2, I still have noticed a disconcerting ability for the AI to defeat more modern units with obsolete ones.
4. Give me the option to accept or decline winning under victory conditions like Cultural and Dominance. While it's nice to leave these options on in case you end up in a tough game and, say, Cultural ends up being your only viable victory option; it would be nice to have it allow me to decline victory under these conditions and continue on with the Space Race, Diplomatic Victory, or one of the other choices while still having the game keep score.
5. Allow me to plug in length x width of tiles for board size. This is step down since Civ2 had this option. It was nice. Why did you decide not to implement it?
6. Currently Artillery cannot be airlifted. Is this by design? If I can move it by rail (or road) shouldn't I be able to airlift it? I'm not sure if this affects Radar Artillery as well.
7. Add more menus for me to keep tabs on things. To see what active trade agreements I have with another civ I have to contact that leader (and risk pissing them off) just so I can check the "Active" box to see what deals we have and how long they are going to be active for. This also applies to diplomatic agreements. While the foreign advisor shows me who I have diplomatic relations with, I still have to contact the various leaders to find out how many turns until expiration, etc.
8. Consider adding to the right click options for units. Would be nice if I didn't have to either a) click the hotbutton icon on the screen or b) learn and use the (unmappable I might add) keyboard commands to do things like Go To, Fortify, Disband, Load, etc. Yes I know some of these work when the unit is right clicked from inside the city screen, but it would be nice if it worked from off the map.
That's all I can think of at the moment. I'll edit with more later.
*edited to reflect 1.16 patch and things that I thought were broken but weren't

1. Give us multiplayer in a patch. Civ2 is an old game in it's first incarnation. It's understandable that multiplayer was released in a seperate version for retail sale. It's almost 2002 at the time this game was released. It really should have had a multiplayer option. Please don't make us buy your game twice to get multiplayer.
2. Increase transport capacity for Aircraft Carriers. This isn't that big of a deal, but it sure seems like I should be able to put more than 4 planes on an aircraft carrier. Maybe an upgraded (nuclear-class) carrier with increased carrying capacity is in order.
3. Consider checking again the combat formula when units of different ages engage in combat. One of the things I remember reading in some Civ3 preview or another was something along the lines of "no longer will a single fortified pikeman on a mountain tile be able to defeat hordes of enemy tanks." While the terrain bonus does seem to have been scaled down from Civ2, I still have noticed a disconcerting ability for the AI to defeat more modern units with obsolete ones.
4. Give me the option to accept or decline winning under victory conditions like Cultural and Dominance. While it's nice to leave these options on in case you end up in a tough game and, say, Cultural ends up being your only viable victory option; it would be nice to have it allow me to decline victory under these conditions and continue on with the Space Race, Diplomatic Victory, or one of the other choices while still having the game keep score.
5. Allow me to plug in length x width of tiles for board size. This is step down since Civ2 had this option. It was nice. Why did you decide not to implement it?
6. Currently Artillery cannot be airlifted. Is this by design? If I can move it by rail (or road) shouldn't I be able to airlift it? I'm not sure if this affects Radar Artillery as well.
7. Add more menus for me to keep tabs on things. To see what active trade agreements I have with another civ I have to contact that leader (and risk pissing them off) just so I can check the "Active" box to see what deals we have and how long they are going to be active for. This also applies to diplomatic agreements. While the foreign advisor shows me who I have diplomatic relations with, I still have to contact the various leaders to find out how many turns until expiration, etc.
8. Consider adding to the right click options for units. Would be nice if I didn't have to either a) click the hotbutton icon on the screen or b) learn and use the (unmappable I might add) keyboard commands to do things like Go To, Fortify, Disband, Load, etc. Yes I know some of these work when the unit is right clicked from inside the city screen, but it would be nice if it worked from off the map.
That's all I can think of at the moment. I'll edit with more later.