Definitely not Amalur, it's fun but overall gets old quick, and the developers are pretty much gone now, don't expect support or future patches or content, the game is probably dead already because of that, and as others say (I agree) what's already "in" it gets repetitive quickly (but the combat system is great, credits where due).
If you want loot and not much else, go with Diablo III, that's a no brainer.
As for Skyrim, it's a great game, no doubt, but it's more about immersion and exploration than anything else. Again, if what you want is finding loot, I wouldn't go with Skyrim, then again it depends on your play style. If you role-play a lot, just walk around towns, talk to NPCs, try out modifications made by the community, just wander around doing random things for fun... you need Skyrim for that.
If you go with Diablo III you'll have a "necessary" go through the basic story and the four Acts of it, do that three times from Normal, to Nightmare then for Hell difficulties, then you get to Inferno difficulty which is the "extra" part of the game in which all you do is survive your way through any given mobs to find that "next best loot" that you'll be using yourself or be selling at the AH to buy something better for yourself.
Someone suggested Borderlands, not a bad idea actually, I also liked it, but Borderlands 2 isn't very far away, I think I would just wait for it instead rather than going with the original. I've also seen Titant Quest in the suggestions, it wasn't bad... a couple of years ago, you might as well just play Diablo 2 instead, but ultimately I wouldn't go with it (again, if you want loot and nothing else, go with Diablo III, no kidding).