I'll have a go:
Elder Scrolls: Overall I think Oblivion was superior to Morrowind, although I liked the weird art and architecture in Morrowind. However, I thought the quests were improved and the fighting system was better. Also, mods on Oblivion have been amazing.
MGS: Difficult to say. 4 is definately better than 2, but better than 3, not sure.
Final Fantasy: It's not out in EU yet so better last gen :P
Tomb Raider: Hasn't really moved on much from last gen, but it concentrated more on platforming than shooting which is where its strength lies, so yeah, improved from last gen.
Fallout: Well, last gen there wasn't a proper Fallout game so I'd say a definite improvement!
GTA: Much worse. They made it far too serious and it had less features than San Andreas. I wanted to fly a Jet!
Far Cry: Much better last gen. This gens iteration was very poor.
Neverwinter Nights: 1 = better than 2