I always find Oblivion a bit meh; it's awesome the first few times but it's lost its charm for me. The drop is brilliant though - one of the most stomach turning rides I've been on.
I bloody love rides. My favourites are probably the Hulk Coaster at Islands of Adventure (definitely my favourite), Nemesis and Air at Alton Towers, and Kraken at Sea World Florida. I also have a big soft spot for Hex at Alton Towers which is really well themed and has a really cool illusionary effect when riding it.