There's a few areas where the tooltips are incomplete or lacking some information. Tooltips are great not only as little reminders, but also as a means of learning as you play. You can shout RTFM at me all you like, but I still hate having to crack open a book (digital or otherwise) just to play a game.
Some notable areas where tooltips are required:
Buildings for units. Training grounds for axemen/champions, machine shop for phalanx.
Requirements for buildings. Even if the requirement of a river for a brewery is met, it is still nice to know that it requires a river (and that this is why it doesn't show up in other areas).
Wonders. Particularly when discovering a technology, I have to click on the pedia entry to find out what it does, as the mouseover tooltip only tells me the cost.
Also, it would be nice if the "Sid's tips" bits were expanded to assist in some long term planning. Like mention what comes down 2 techs further along the line with a particular tech to give people a better idea of not just what tech does what, but what tech will do what later on.
Promotions. At least for negative ones, it would be nice to know how to cure them easily, and could be included in the description.
Guilds. When mousing over a guild in the city view, it doesn't display any information except the name of guild. (as a side note, it seems every guild is a "headquarters"). It'd be nice to know about the mercenaries' guild, ratcatchers' guild, etc. I noticed that some units got the "hire mercenaries" spell but did not know why (I must've missed the message).
Some notable areas where tooltips are required:
Buildings for units. Training grounds for axemen/champions, machine shop for phalanx.
Requirements for buildings. Even if the requirement of a river for a brewery is met, it is still nice to know that it requires a river (and that this is why it doesn't show up in other areas).
Wonders. Particularly when discovering a technology, I have to click on the pedia entry to find out what it does, as the mouseover tooltip only tells me the cost.
Also, it would be nice if the "Sid's tips" bits were expanded to assist in some long term planning. Like mention what comes down 2 techs further along the line with a particular tech to give people a better idea of not just what tech does what, but what tech will do what later on.
Promotions. At least for negative ones, it would be nice to know how to cure them easily, and could be included in the description.
Guilds. When mousing over a guild in the city view, it doesn't display any information except the name of guild. (as a side note, it seems every guild is a "headquarters"). It'd be nice to know about the mercenaries' guild, ratcatchers' guild, etc. I noticed that some units got the "hire mercenaries" spell but did not know why (I must've missed the message).