In General....
You are looking at surplus military rifles, that have been to the wars, and quality varies a lot. The former Soviet countries dumped a lot of them on our market, so they are cheap, but the supply is drying up, and they are getting more expensive than they were. The same goes for the ammo.
Sights are fair, trigger pull is generally poor, the safety is so awkward that most people don't use it. Built to survive and function in an army of peasant conscripts. Not the slickest bolt action design, but usable.
The 7.62x54R is in the .308 Win-.30-06 class for power, and a fine choice for game, with hunting ammo. Hunting ammo for that round is not cheap like military surplus, and not found everywhere.
I consider the Moisin Nagants to be in two classes, those in good shape for milsurp collectors, and the rest for cheap beater rifles. I have a couple, the 91/30 and the M38.
BE aware that groove diameter on these old guns varies a bit, and while some are very accurate, others are not. And the quality and accuracy of milsurp ammo varies a lot too! If your rifle doesn't shoot worth a darn, first, try some good ammo! And then there is also the whole corrosive primer thing with suplus ammo. Nothing huge, just a pain taking the extra steps cleaning it.
Also the M44 carbines were built to be shot with the bayonet on, and point of impact changes a lot if you take it off (or just have it folded!)
They are a long way from a good hunting rifle, but they will work, if you do your part.