LL players are terrible at NL MTTs. You can't be super tight at MTTs. But at same time you can't go around calling UTG raises when you have AQo. Read, re-read, and re-read HOH. And play MTTs. And then re-read HOH.

I think personally the biggest problem for many is not so much opening from MP with ATs or whatever. Instead it is calling raises from early position opponents: that is a death wish (if you hold less than AA/KK/QQ and non-pairs less than AK).

Also, the donkeys out there can be frustrating, even though we "win" in the long run because of +EV of our cards (but the long run for MTTs is a long, long, long way away).