Well I have been playing Oblivion, Two Worlds and Neverwinter Night 2 this year. I got The Witcher (Neverwinter 2 engine) in a birthday box ready to unpack soon ;-) and I assume I will eventually get Hellgate London as well (after some more patches come out first).
If you are a roll playing fan like me you will get all three. The first three are available at reasonable prices now, so it might be a good time to put them on your Christmas wishlist if you haven't got them.
So wich one is the best?
Well if you are heavilly into mods, then Oblivion will give you the most fun. The modding community for the elder scrolls games is just fantastic, with Neverwinter coming up second. Oblivion is wonderful in its expanse and of course Neverwinter excels in typical D&D type RPG.
But if you want a good story line and first clas out of the box experience then Two Worlds beats the others hands down. The main story really grabs you and the side quests are real stories of thier own, not just a bunch of problem solving quests. The writers for Two Worlds did a much better job making the indivudual Guilds/Factions really interesting with mystery, undercover agent and backstabbing type involved story lines.
Two worlds gives you a rich feeling to it's world. It is much more real than a hack-and-slay environment in which every 10 yards there are new monsters that (ignoring each other) just wait for you. In Two Worlds the towns are interconnected, the people have stories that are rich and deep and nost just "go get the stolen potatoes from the orc" (Oblivion). Monsters hang out in there home environments and are not just peppered all over the map. Horses can actually be used, they help you carry stuff and you can ride down the bad guys with it as well. A lot of the "mechanics" of the world, like training come across much better than in any RPG I have played since the old Might & Magic 3D (1990s) games. While the hero is a bit more grimy, he is much more realistic for all that. Personally I believe this to be the best roll playing game out in years. So go get it if you haven't already.
#1 Two Worlds
#3 Neverwinter Nights 2
The Wicher (not yet rated, but probably 3 or 4)
Hellgate London seems to have some problems but looks good for single player, which is what I am into. Probably very good but after the others mentioned above.
Note: it seems that gamespot things "clas" with two ss is a four letter word. It replaces it with four stars. That's why I had to mispell it above ;-)