PC:

1: I hate the price of keeping with the times, next year I'll be upgrading my GPU and doubling my RAM (up to 4 gigs) and that alone will set me back a good 450-500$ here.

2: I hate stinky programming in games that never gets mentioned in reviews (yes, Crysis, I am looking at you).

3: I hate the decline of the golden series from the past with the modern devs, such as Fallout 3, Deus Ex and Thief series.

4: I hate that many PC centric devs are now turning more and more to the more lucrative console market (Epic, Atari and Bioware for example).

5: I hate the fact that 90% of the big budget titles released for PC turn out to be either mind-numbingly boring or extremely shallow or both.

6: I hate that developers like Valve and Blizzard, who are perhaps the last two quality devs who really put an effort into mostly PC titles, take forever to release and develop their games.

7: I hate running out of storage room all the time so I have to delete something every single time I get something new (new HDD next year, sorely needed).

8: I hate the endless nagging about updates and fixes/patches for games and software and the lackluster security of Windows and many web browsers of today.

9: I hate games that get released with crippling bugs and glitches (Thief 2 couldn't be completed because of a glitch that never finished the mission and a 42 MB patch was required... in the dial-up age...).

10: I hate the takeovers and killing of great devs such as Westwood and Flagship Studios by huge software "houses" such as Activison/Blizzard and the notoriously fierce EA Games.

11: I hate waiting an extra year for the console hits (Gears, Fable, GTA etc.).

12: I hate idiotic copy protection that prevents legal owners of a game to enjoy it fully that is easily bypassed by the pirates anyhow.

13: I hate the noise... If you think the 360 is loud; get a good gaming rig with tons of HDD's, a huge cooler for the cabinet and a noisy GPU (i.e; any modern GPU so to speak).

14: I hate the system dumps you have to take every year or so because everything turns to sloth and the system runs like syrup in cement.

15: I HAAATEEE MMO's that distract devs from making proper, single player games! (Blizzard gets the evil eye from me here).

16: I hate overrated games that get lauded for not being spectacular and have glaringly obvious weaknesses (Bioshock, Crysis, F.E.A.R).

17: I hate the lack of good strategy games like Civilization, there really is no decent alternative.

18: I hate playing racing games on the PC, screen is too small and there's no comfy way to use a steering wheel on a desk, and the keyboard controls suck big time.

19: I hate all the complications around something as simpe as multiplayer over LAN; there are only a handful of times we've been able to simply install a game and play it. Always some shit with IP problems, high ping, timeouts (or syntax errors in the olden days) and of course; shitty multiplayer interfaces in games.

20: I hate the fact that despite all of the above, I still see the PC as grossly superior to this gen of consoles, which really says a lot...

Edit: 21: I really hate that Microsoft basically owns the OS market and DX setups and are making such shit versions of Windows to sell support software and get hits on fix/patch pages.