I think I disagree with you, kymupa. Even if he shoves, do you really think he would do that with worse than QQ, let's say at best AK where you are flipping? I just think that, at these limits, people tend to 5 bet or even shove over a 4 bet with only AA or KK. It's almost never AK. Against that range, you are just in terrible shape.
Also, in my own game, I noticed that I have difficulties to play those kind of situations when you play postflop. In this case you have a very strong pair and most likely it's going to be an overpair to the board.
Lets say that the flop comes: 285 rainbow. He bets 55 percent pot. What do you do in this situation? In this case, we are already playing for stacks only 100 bbs deep. We really should look to get the money in here, because just calling and risking an overcard on the turn makes it really really difficult. If he has AK, we protect our hand and pick up the pot. Some really bad fishes just call with AK here hoping to spike an ace or king on turn or river. But what I want to say is that we always are stacking if we have such dry flops, just to see them having KK or AA.
If we flat preflop and we see the same flop, we can easily get away from our hand, since villain has position on us and since there is an overcard to the board. We have to respect his position and his aggression here I think... Especially at 5 or 10 NL where people play straightforward in 3-bet pots.
These 2 situations just show how difficult it is to flat the 3 bet pre-flop. That's why I like more the 4 bet and fold to a 5 bet.
What do you guys think? It is really something I am struggling with in my own game and I am trying to think about these spots quite often just to figure out how to best approach them.