Will PC version have better graphics? Doubtful, since they didn't bother to make any amends on any of the previous games since MW1.
I don't think I will play it, will depend on reviews that I see for it.
Now as far as liking it, I like their single player campaigns, I don't like the multiplayer, so for the game as a whole I'm 50%.
Truth be told, the single player is not bad, because there's some degree of plot behind it, and sometimes you get atmospheric missions that are fun to play through. But, beyond that the game hasn't improved much since mw1.