Sometimes I go back and forth from campaign to playlist, and that seems to be what is confusing matters.

H1 seemed to have major checkpoint problems for me. I would die and be warped back WAAAY early in the level.

H2 seemed to work ok, I didn't notice any weirdness

H3 also seemed to work ok.

Only done one level of H4 and it was very jittery, choppy and inconsistent frame rate.

MP is still unplayable for me. I've maybe played 10 games because I can rarely find a match, then when I do, the game usually freezes in the post game lobby.

H2 MP is still dumb in that...they really did give us the game that launched. Standard slayer has SMG starts and sissy nades.