I would have no problem with that. Currently the game I'm most looking forward to doesn't use any 3rd party software for trees, physics, etc. so it won't impact me either way. The game uses an engine that was completely designed from scratch and is more advanced than anything else currently available (PhysX, Havok, etc.).
Which title is that? I mean crap, even indie games I supported lately which wouldn't have ever been ALLOWED to be produced by big mega corp seem to be made with glitchy coding anyway (not all but enough), as the teams are so small. Something good on a better engine would be a relief.