Tandaw
Chieftain
This is one small thing about the game which really bothers me. I love the unique flavour that comes with playing a civ. If I am Rome for instance, playing the wide, empire building, and foe crushing strategy just feels good. It bothers me however when the units that I get as that civ lose their uniqueness upon upgrade. Take the roman UUs for instance. Once they are out of their age there is nothing special about them. I find that when I realize nothing carries over that the unit become much less valuable to me. Look as say the Aztec Jags, their heal-upon-kill, jungle movement and bonus makes them worth keeping around through the upgrade path. Then there is the Babs bowman, small niche window of use and no upgrade benefits....it just takes some value out of them.