Oh my god i can go everywhere and do anything ...........SICK. Lord of the Rings aint got nothing on this
You can start off as pretty much anything you want elf, a reptile and even an orger. and leveling up is just plain fun because thier is so much to increase you just want to keep on playing and playing. like your sneak ability just click the left analoge stick and walk around and thats it. in a while your sneak ability will be full.
and the terrain couldent be any longer like if you go to the bottom of the world in oblivion and try walking all the way to the top of the world it would be a real long time but you might discover some secret cave that you might not know about with a cool item in it worth checking.
in all case the game is amazing and totally worth the time.