I couldn't care less whether the games are 720p or 1080p. Sure 1080p looks crisper but with games like Mario Kart 8 and 3DWorld it doesn't matter at all. Super Mario Galaxy (2) looks almost as good as the most 360 games on my 50 inch plasma and that's just 480p.
I'll get X, Mario Kart, 3DWorld, Smash Bros and Wind Waker regardless of their resolutions.