Oblivion - after playing fallout 3 it just seemed dated and slow. I don't think I'll ever finish it, just don't have the time and patience.
The last splinter cell on ps2, cant rememeber what it was called but it just bored me.
Halo the first one- bought it quite a few years after it came out, but it was so repetative I couldn't finish it, the Multiplayer was good though.
Hopefully this turns out good. I actually quite liked Homecoming, despite mixed reviews. If your a SH fan and haven't played it's worth checking out as you can probably get it pretty cheap now.