You know, I can't say I much liked any Cid.
I's was non-existent, and made me sit through the crappy Dissidia storyline somehow DESPITE not being existent
II's had no personality to speak of
III's was in my party for all of five minutes, blew up his airship, then stole my elixer
IV's was okay until the creepy DS model D: The way he wiggles his body is not natural... and those lips! O_O
V's looked llike a hippy and was the cause of Mid, little brat
VI's looked like a used, chewed-up condom, and was on the bad guy's side
VII's yelled at me to drink tea D:
IX's is probably the best, no real complaints here
X's was a southerner. And I hate them southerners. (Relax, I kid. Though I did find him annoying. Plus he spawned Rikku >:()
XII's were both annoying
XIII's was also fairly decent, so no complaints here

Though I would say Tactics Advance has a pretty notable Cid, for being a drunk. WOOOO.