I'd like to see his power match his size a bit more, and I think Heisey is hot on his heals, and maybe passing him as the top CF in the system. In a larger sample, Heaisey has outhit Stubbs at AA, and by a wide margin. Stubbs has run more this season, but Heisey has been more successful. Power wise, Heisey in a landslide.
And none of that makes Stubbs a bust right now. The Reds have an interesting OF situation developing. Heisey, Frazier, Dorn (I think he's starting to heat up.) and Stubbs. Alonso is a wildcard that could force Votto to LF (I don't think he should, but he could.)
It looks like the Reds once again are about to have a glut of outfielders.