I generally only really play NL holdem when I am in a tournament or a sit and go.
Limit play you have to tighten up more post flop as you can't bet someone off the pot, its generally not a lot for people to call, so bluffing
almost always isn't worth it.
Chances are also if there are a lot of people seeing the flop and there is either a straight or a flush draw then someone is more than likely going to stay in the pot chasing it.
On the plus side as its generally not a lot more for them to call bet away with your better hands and more time than not they will call with the losing hand.
Best advice I can give that I have learnt the hard way is to not bluff (unless maybe heads up) and be careful playing from the blinds (big leak for me that I am working on)
Thats not to say never bluff but a lot of the time it won't work, as I have found out to my cost.