Getting small pairs and suited connectors in a tournament when stacks aren't deep enough to play them.
It really depends on the table dynamic, especially small pairs, but overall, those are hands you generally don't want to be putting chips into the pot if in early position. If you're in the Small Blind and everyone has folded to you, then those hands do VERY well against the Big Blind's range.
10 5 is the hand don't like
That's a hand I'm never playing. You can't make a straight with that hand. I am neutral about the hand because it DOES DO so poorly that it's not a hand that's going to ever cost you chips in any game.
Mediocre hands utg like AJ's or qks they play so poorly from that position. I'm at the point when I just fold them pre.
If you're in early position against people that are very capable of 3-betting your opening raise, those hands are so awkward to play. You're almost better having those hands in the blinds, and actually DOING the 3-betting, applying pressure to earlier position raises. Of course, it's also knowing your opponent and how aggressive they are. At that point, the cards almost don't matter because if they're raising a LOT, you can 3-bet them from time to time and pick up chips easily enough.
AJ/KQ hands do tend to cost more money than they make money because of kicker issues.