I hunt deer every year with an sks. I've heard/taken a lot of flak for it, but every single year, i put meat on the table. Can't argue with results!
A few caveats: Here on vancouver island, the deer are small, and the shots are rarely over 75 yards in the areas that i hunt. I practice year round with surplus ammo, and am very familiar with my particular gun. Familiarity with your rifle is key. Get to know your rifle! Find out what it can or cannot do.
Something most hunters forget to keep in mind is that for many decades, prior to about 1950 ish, scopes were unheard of and animals were thumped behind a set of irons. I would wager that the majority of all the deer ever harvested have been with irons, and at least in canada, with a *gasp* SURPLUS enfield. The sks however, can be a fantastic brush hunting gun. Same with the mosin.
With the sks, i'm never afraid to scratch the stock, it's dead-nuts reliable, semi auto for the quick follow up shot when necessary, and the short length makes it quite handy.
EDIT: Not sure this needs to be said, but obviously always use quality hunting ammo. Hunting with fmj is really stupid and highly unethical, not to mention probably illegal.