My brother bought Medal of Honor for Xbox on the cheap, and he let me borrow it. It's not bad. I'm enjoying the campaign, but the game plays similar to Battlefield (no surprise, considering DICE's involvement), which to me isn't as smooth or as fast as Call of Duty's gameplay (at least in Infinity Ward's entries, anyway).
That certainly fits the first-hand accounts of MoH's gameplay I've heard so far.
I'm still not convinced it's worth the purchase, maybe I'll check it out once the price hits rock-bottom in the UK