I have one as my primary duck gun and love it.
Face it nearly any pump is going to beat you up with 3.5 inch, the nova is no different in this respect.
I have had only a few problems with it so far.
First you need to shuck it like you mean it. A half ace effort will jam it, at least it will mine. Its never been a problem on game, only when I want to unload it when at the truck. A half effort pump and mine seems to release a shell from the mag before the first has really cleared the gun resulting in a jam. Not a big issue, and certainly nothing to be concerned with in the field.
I love the way mine points and handles in the field. Out of the box it just fits me, and I only have to think dead bird and its done. Of course this might not be the case for you, and many guns have shims to adjust the fit, but for me this was the right gun.
If your hunting in the cold, clean it well and lube it with a cold weather lube sparingly. Mine worked straight from the shop all season on ducks until about -10C or so when I hung it up. Last week at -37C I got the dreaded frozen firing pin, the cause to much 'gelled' lube. A cleaning fixed that right away. Not a problem specific to the nova, but something that should be done with any gun, silly me.
Frankly, if I was given a bizzilon dollars I'd still be shooting the nova. I have a mossberg, a rem, and a browning, and I don't like any of them nearly as much as the nova. It feeds and shoots anything I want to put into it, it patterns well and on center, and it just fits me like no other. I would go so far as to say you could use it as a canoe paddle, shoot a duck with it, then happily paddle some more.