They aren't as nice as a good Mauser, but they are serviceable rifles. My 91/30 is, so far as I can tell, original, and has a very bright a clean bore, but a dinged up stock, and handling wear on the metal. My best groups were recorded with Brown Bear FMJ; and it'll hold tennisball size groups at a hundred yards if you do your part (I'm sure better ammo and a sled would make for much better groups, as would an optic, but it is what it is). Rommy Surplus means groups about twice as large, but Russian surplus will shoot basically as good as Brown Bear. A small dab of Testors Gold on the front post makes it a lot nicer to try and aim with. You don't need Windex with Ammonia to get the corrosive primer salts out of the bore, Hoppes #9 Powder Solvent will dissolve them just fine (as will Ed's Red, if you use the version with Lanolin).
My other Mosin is a M38, and that's a great gun mostly because of the daylight visible muzzle flash.