One thing that's bothering me a bit is the overall difficulty of the game. It's very inconsistent, annoyingly so.
It does feel like Oblivion with guns, it basically ís Oblivion with guns, but it's definitely a LOT better than Oblivion. I haven't finished the game yet and am not that far, but already it's about a 100 times more interesting than Oblivion was.
Probably it's a matter of taste having a different setting and so on, but I mainly got bored by Oblivion's core gameplay,
Cheers