umaril was bigger-than-average...
you know, the bosses in these games seem kind of... light-weight... they go down way too quickly, have nothing special to show off except some nice-looking, but not all that unique, weapons... and some constant effects boosting their strength/resistance a bit.
it seems like everything we come across, even bosses, its just a test of who can hit each other harder.
of course, if you decided to explore the world a bit before doing the main quest, you'd be 2-3x more powerful than the boss by time ya reach em.
hopefully the new engine and new leveling system similar to fallout 3's will allow us to actually struggle against bosses, even with the difficulty set to easy.
to be honest, i had to read that the enemies i fought at certain points in oblivion's dungeons were BOSS-level enemies... they went down just as easily as everything else, mostly... wouldnt exactly consider them bosses, just stronger-than-average enemies.
a boss is supposed to be terrifying and make you feel not-so-invincible.