I thought he was gorgeous. My husband had those kinds of looks when he was young, with a wee bit of the "bad boy" element attractive to some women. Loved his three movies "Rebel without a Cause" "East of Eden" and "Giant". The latter portrayed his acting skills as he had to age from a young man to an old man in that movie. Such a pity he died so young. Went out in true rebel fashion - in a fast car!
I've only seen Rebel Without A Cause. It was okay, though I have never bothered to seek out any more of his films. I was struck by the similarity between him and a young Brad Pitt (eg. in Thelma and Louise).