Morrowind will keep you playing for well over 300 hours, if you like rpg's and don't mind graphics from 2002. Oblivion is more like an action game with rpg elements, Morrowind is 100% rpg. Also, for me, without mods, oblivion gets boring very fast once you've completed the main storyline.
I don't really understand your point TC. Sure there are people who have only played WoW, but I doubt it's the majority. Many come from other mmo's, and a long past of gaming. (Me for one, and everyone in my guild)
What is popular is not always good (Especially true for the halo series, incredibly overrated). If you liked the other CoD's, and don't mind the exact same gameplay with new skins/models, then CoD4 is the one to go with. But I'd say CoD4 is definitely better than halo, although I don't really like either of them.
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