Engerek01: Civilization 5 was amazing. I loved it more than 3 and 4. I hated 2.
Civ1 is still my favorite in the series. I played it probably for million years :)
Unfortunately I haven't played either of the first two games for many, many years. I don't remember much about the first
Civ, but I do remember that I really enjoyed the sequel. The worst part was the ugly looking map after the invention and construction of rail; the crowded maps really looked poor.
I've played both III and IV, from Gog. My laptop is unicore, however, and quite old so I can only play games for about two dozen turns before they become irritating. :(
I really like
Alpha Centauri, too, except for the nauseous colour scheme.
edit: typography