F-Zero GX is actually playable now too (out of the box - I didn't have to tweak anything - before it was a sound stutter mess).
I'm not sure if this is due to the fact that I installed a Geforce 660 Ti in this PC, or the emulation is just that much improved. But I'm hopeful its the later.
NFS: Carbon is playable, but the cut scenes inbetween levels are scrambled. Just click through them. (didn't work very well in Dolphin 3.5)
NFS: HP2 is not playable. The sound is still jacked up to hell.
Spy Hunter is playable now as well. (didn't play at all in Dolphin 3.5)
Simspons Hit and Run plays great. I have no idea if it worked in 3.5 or not.
(How have I never played this game before? DOH!)
4x4 Evo 2 has the same sound issues that NFS: HP2 has. Playable, but the sound is so bad you don't want to play.
Mario Kart Wii and Mark Kart Double Dash play fine - but they played fine in 3.5 as well, so nothing new there.