Background - game fished out of sydney for a number of years and been around marinas for a while, but never owned a Riv. My business partner does.
Rivs are built as family/crusing boats. Round nose for bigger room at the front, flatter bottoms, bigger salon, smaller back deck. They are not aimed at the offshore market.
Build quality is appropriate for that market. Run it in a sea and they are usually wet and pound and not great in a following sea - simply because of what the hull is not aimed at that.
Game/Offshore boats are finer nosed, deeper V, heavier, less space, use more fuel.
Despite claims, its an imutable law. Light high volume hulls get knocked around. Heavier deep V's less so.
So its a case of what you want it for. If its mainly crusing with family, its fine. It will also be ok at sea on a bad day - just go a little slower.
Also, push most boats too hard offshore for a period of time, and bits will crack. If you have ever been on a good sized boat that has gone over a wave and found nothing but air, you know that sickening crash as the ass hits the water is doing some damage even if you can't see it yet.
Summary - get it checked and assess it based on expected use.