Bloody over-tough RTS section on Brutal Legend
(the 'bridge' bit, near the end). Was LOVING the game until that point, but have now abandoned it. It's one thing spending a couple of minutes to beat and lose against a boss in an arcade game, but to spend a good 15-30 minutes+ and then continually fail on an RTS bit, especially as it's not primarily the main gameplay element of an otherwise very high quality game, really is a frigging nark.
WHY did they even bother putting them in????! No f*cker even liked them, anyway!!!!!
That and the fact my second, 'reliable' phat PS2 has pretty much stopped reading blue discs, and a lot of PS2 games I've recently bought are on blue discs(!)