The Tarkin isn't anything major. He's not as good as he could've been. The colors are off some, and the head needed far better paint aps IMO. To me, that's the glaringly obvious failure on the Tarkin figure. His hair's much more varied in color than they gave, and I find his skin tone odd, the eyes a little odd... It's nowhere near perfect.
The uniform color isn't as bad as initially thought, but it's also not perfect. The POTF2 figure's color is actually perfect, and the paint aps superior. The sculpt just suffers.