Ok this has been put up here in various forms but I think it just needs to be generlized into one category...
RTS AI's
Ever tried the campaign to Wargame: Airland Battle? Yeah, I did, until I got to scenario two.
Oh, I see you created a large forward army, good thing I know exactly where you are, yeah, I do, I don't need recon or anything. Oh, and btw, I know exactly how far and just where your recon can and can't see, even if there are no visual indicators for it in the UI, lol casuals.
So while you're busy driving steadfast towards the one sector I own, I'll be driving my murderball of units on this road in the middle of nowhere, bypass your armies, and show up in that one sector you own. Oh, I see you left recon and anti-air, and whats that even some anti vehicle defenses around your command truck stationed in that village? Whatever, I'll just send this ATGM unit to that singe patch of land your recon can't see, and snipe your command unit at maximum range, through five bushes and between 8 buildings. (this seriously happened to me)
"You are done AI! For I am the player! and I will simply defend my command vehicle and await your armies!"
lol, no problem bro. Did I mention I know exactly where you are? and just how much force you command? Yeah I ain't going near that thing, I really don't mind plopping my murderball on some random hill and waiting out the game timer. Try to find me? Enjoy losing all your recon units, cause I know where they are, and if they're alone, and I'll murder them all.
"HA! I have defeated you in combat AI. I know your tricks now, there's no---"
Let me stop you there, maybe you did win that battle, but there's about a dozen more ahead of you. Oh and I started this scenario with all the territories except one, sure you've captured a few by now, but my piggy bank is pretty full from the 6 or so turns it took you to get even with me for resource points, and I'm not letting that money go to waste. Enjoy fighting my eight divisions of reinforcements, 3 of which are on the same territory, fighting your one division, its true I really do like playing the same map 3 times in a row.
"I will never surrender AI, I have endured, I will come out victorious..."
Tactical nuke.
"screw this"
(There might be worse AI's, but this is the worst I've personally come across. Compared to crap like this I don't mind AI getting resource bonuses unless its some rediculous boost (see, GalCiv2 upper five intelligences))