Without mods I'd play Skyrim for a month or two, maybe.

With mods I'll be playing for years. This based on my experience with MW and OB.

I won't deny that Skyrim looks great on a 50+ inch LCD screen. But just the few mods I've added already (mainly texture enhancements) tells me that PC is the only way to go. Honestly once the creation kit comes out I will literally weep for those playing the game on the PS3 and X-Box 360.

I was once a mod hater like you until I took an arrow to the knee..