Lets not even talk about UT godmode bots -.-
effing November is nearly impossible with godlike bots.
but I find AI to be the most cheap/annoying when they play the game like your obnoxious 12 year old brother using Eddie Gordo in Tekken to beat you. For example, in Onimusha, the soul suckers, when you play on hard they grab your hand ALL the time with no time to recoup and attack them. Grab, shake off, grab, shake off. Its just downright obnoxious. Or any of the Warriors series, in this case Samurai Warriors, the enemy officer will knock you down with a power attack, the minute your on your feet again you get knocked down by the same move. Now repeat this process several times. Thus your unable to attack for a good 2 minutes and your lifebar is significantly chipped away. I don't find as many issues with FPS AI, but there are some. In UT, any bot who you've made swiss cheese out of with the minigun, and then served a face full of flak, and still lives, is most defenitely a "OMFGWALLHAKKER", especially considering with 199 health and full armor/shields, one or two shots of well placed face flak will make you a steaming pile of USDA sirloin.
"They're everywhere, the little harlots."
-Martyn