I don't have a problem with a quality synthetic stock....my problems come from the CHEAP synthetic stocks.
Pretty much anything you'll find on a rimfire classifies as a "cheap" synthetic stock to me. They aren't very rigid, have TONS of casting seams, and don't have any reinforcing or aluminum pillars like you would find in a GOOD synthetic stock.
I've found that the majority of the synthetics found on rimfires from marlin, ruger, savage (especially!), or remington tend to be very flexible. If you over-tighten the action screws the stock will distort. If you float the barrel, it all goes away when the rifle rests on the forend. For the most part, it seams like all those with synthetic stocks also have synthetic (molded in) trigger guards.
Some of the higher end centerfire rifles don't seem to have nearly as many troubles...much higher quality stock, still have removable (STEEL) trigger guards, and more importantly to me a quality bedding system (usually aluminum) that will rigidly and repeatably place the action firmly in the stock.
Personally, I'm a laminate fan. Laminate is pretty dense, and more attractive than the cheap beech and such that is so common today. It is also MUCH more resistant to warping and won't flex nearly as much. I'll usually throw a few light coats of linseed oil on, followed by a good quality gunstock wax and call it a day. If you make sure to get the action/barrel channel as well, it's gunna be pretty hard for moisture to affect the stock.
I'm not a benchrest guy, either. The majority of my shooting comes in and around hunting season, or plinking in the woods. My rifles aren't babied, but I take enough care of 'em to keep them looking nice and performing well.