I'd agree with KHlover, realistic looking games (mostly) don't age well at all.
I'll go against the grain with SFIV though, I thought it had a really original art direction. It's one of the rare games where the concept art is actually faithfully translated into the game itself without major discrepancies. I'll admit it took a while to grow on me though.
Agreed with NSMB, it looks horribly bland and plastic compared to the older sprite-based games. More worryingly, Nintendo's applying the same look to the new LttP and Yoshi's Island.