I may get flamed for this, but I think the S&W M&P pistol triggers are almost always pretty good right out of the box--that they are better than the Glock's and most Springfields--even better than the trigger on my Springfield Xdm, which is a pretty nice gun in and of itself.
I have seen a couple stock M&P's that had triggers that didn't feel like the the typical standard M&P, but that happens with gun companies--a small percentage just aren't quite 'up to par' to the norm for the series.
As someone said earlier, 'good' is a subjective issue and can be different for a lot of people. Personally, I don't like a really light trigger. I can empty a magazine pretty darn quick already--- my fingers are still fast. Sure the M&P's trigger can be modified for more smoothness, 'creep' and other characteristics, but personally, I don't feel a burning need.
I'll admit that most Sig Sauers have a nicer feel to their triggers to me and their higher end guns seem a bit more 'refined' if you will--sometimes the overall gun just feels better period (for a premium price), but I think it's hard to beat the standard M&P pistol OR their triggers for anywhere near the price they go for. I have more expensive guns that feel different, but I have no qualms about carrying an M&P or it being one of my favorites out on the range--it's comfortable in my hands, on my waist and I have never had any unpleasant surprises from one.
To me, it's a great gun, very sturdily built, that maybe other than adding some different sights, is a dandy right out of the box at a great price and will likely be handed down to my kids someday (even maybe their kids) and you can't say that about a lot of guns in it's price range.
