I know Infamous and Sly Cooper were fairly successful titles, but they'd have a much bigger hit on their hands if they hired new art staff/directors. I've felt this way about all Sucker Punch games - their games have great mechanics, have a unique flair, and are all-around solid experiences, but they're a bit lacking when it comes to visual appeal. There's something extremely cheesy/low-rent about their games' art design that puts me off.
Having said that, the gif of Cole hurling a car at Zerg Boss is pretty sweet.