The Orrery depends how much you value the couple of bucks it costs to get
I'm happy enough with it, you get some decent kit from the quest NPCs. If you're into eye candy, getting it just to see the Orrery fire up is worth it alone
Oh, and that level 2 game finish BS. The main quest isn't terribly long. With some dedicated effort you can finish it in a couple of hours, I'd say. That would, however, completely disregard 1) the other 95% of the game, 2) the difficulty factor being in the player's control at all times. I hardly see how it's any more of an issue than being able to get the ultra EQ in Morrowind and break the game balance. In fact, it proves that the levelling system that Bethesda have used works exactly as intented. Funny that, eh?