Well recently I bought some regular Xbox games that I hadn't played in the past but wanted to.

Fable
Half Life 2
KOTOR 2

and all 3 of them screw up when played on the 360.  They are playble, but the framerate slows way down, the sound screws up occasionally (in kotor 2, the sound screws up constantly).  Anyone else experienced this?

I recently had to get my regular Xbox hooked up just so I could play these title with everything in tact.