Heath:
Actually, that would just put you in the Terrestrial Kingdom, not the highest kingdom, assuming you lived a good life.
It's more along the lines of you get out of it what you put into it. If you want to go to Harvard, there's a lot of work that goes into getting there, but there's a lot of reward. If you're happy working at McDonald's, then you can be happy doing that work. So your statement is not exactly correct unless you're the kind of guy who doesn't care to meet his potential and is happy with something less than the best.
Sure, if you believe it's true then that makes sense.
From a risk assessment standpoint, it would make more sense to try and follow at least one of the religions that threatens hell, because the consequences for being wrong there are MUCH higher.
The consequences for being wrong about the LDS faith? A slightly less fancy eternity. I could totally live with that. Burning in conscuious torment for all of eternity on the other hand...
My guess is that strictly from an endgame perspective, becoming a follow of Islam is maybe the smartest. At least in Christianity you have some growing beliefs of annihilationism, or universalism in there. I'm not aware of those beliefs being a part of the Islamic faith, though I really could be wrong (in fact I suspect I probably am).
I know Buddhism has a sort of hell for the very worst, though the chance of the regular folk going there are pretty slim, and even then you'll eventually find your way out of there, though it could take a REAL long time.
Purely from a logical and endgame perspective, the LDS faith is way down the list. Of course there is the whole 'But it's true!' part, but I'm not really dealing with that perspective here :)