I've had a lot of problems with the emulator in general, crashing being a big problem but overall glitchy behavior the whole way through for me. Performance probably varies from computer to computer but for me it's been not so great... crashes are very sporadic, but keep happening. So I'd like to take the chance just to elaborate on all the issues I've had:
F-Zero GX: Haven't played much, crashed once, occasional lag
Minna no Rythm Tengoku: Some slowdown at specific spots, blank screen at Remix 6
Zelda Four Swords Adventures: Great, no crashes, some graphical glitches though.
Luigi's Mansion: Crashes sometimes.
Mario Kart: Double Dash!!: Crashes sometimes, no BG music
Mario Party 4: No crashing, some texture and audio glitches.
Metroid Prime: Crashes make the game unplayable, odd audio glitch underwater
Metroid Prime 2: Runs worst out of all the games, constant crashing, audio and visual glitches.
New Super Mario Bros. Wii: Coins don't rotate unless EFB Copies are set to RAM, at which point the game runs at 50% speed or less and is likely to crash. No problems otherwise with it set to Texture (yet).
Paper Mario Thousand Year Door: A lot of visual glitches, only played for a few minutes but I'd guess it's capable of crashing.
Pikmin 2: Runs great, but crashes.
SSX 3: BG Music doesn't play, intro looks messed up. Otherwise fine.
Star Fox Adventures: Laggy, crashed once or twice so far. Voices are off-sync in cutscenes.
Star Fox Assault: Wasn't worth it. The game is terrible.
Animal Crossing: Perfect
Super Mario Sunshine: Crashes, otherwise fine.
Super Smash Bros. Melee: Some slowdown, have't played much. I think it may have crashed once though.
Zelda Wind Waker: Other than the smoke effect glitch, incredible. Wish all the games ran like this. I'm only at the second dungeon though, so I don't know if it holds out.
Zelda Twilight Princess: Fine so far.
Simpsons Hit & Run: Can't get past the first screen.
Mario Galaxy 2: Slowdowns are very common, audio plays once and doesn't loop, crashes occasionally.
As you can see, a few of the games are working quite good but most of them like to crash, some more than others. It crashes in different ways, sometimes it gives me a specific error message, sometimes the graphics give out and audio continues playing (meaning the emulation is still going, just with a blank screen), and sometimes it just freezes and says the graphics card stopped responding.
Another unrelated issue I had with the emulator was with playing back .dtm recordings. I record my gameplay normally and save the .dtm file to a directory when finished. Clicking Emulation>Play Recording... and selecting the .dtm file either emulates the first game in my list as if I had normally double clicked it, makes the program stop responding, or tells me it loaded the save state but just shows a blank screen.
Most of the games in the list, at least for me, all need to have specific settings to run correctly and it would be really nice if you could save your settings for each game and just select from a list, just like you can for your controller configuration. And finally, if you change graphics settings, give it a go and it crashes, on reopening the program you'll see all the settings have reverted to what it was before for some reason.
If anyone has some suggestions for increasing performace, a different rev or whatever, that'd be great. To see my machines specs as well as default settings, you can see my other thread here...
http://forums.dolphin-emu.org/showthread.php?tid=18266 I have changed the backend from OpenGL to Direct3D9 because OpenGL runs much worse for me, but otherwise the settings are generally the same.
Here's hoping this'll get fixed in a future Dolphin 4.0... that's the only hope I'm holding onto at the moment. Dolphin programmers, if your reading this, take note!
EDIT: Forgot, another issue I've had is sometimes I'll just get a black screen when I open a game, closing and reopening a few times does the trick. Should really open fine the first time though.