Having slagged off his initial signing, I actually quite like Riera. I think he's capable of a lot better than he's shown so far, and I'd like to see him encouraged to come in off his wing and crack it a bit more. Another facet of his play which is under-utilized is his heading ability. Get him in the box when the balls out on the right flank. He's good in the air and can score from the back post I should think.
I know he didn't get on with the previous manager, but he was hardly on his own lets be honest so I wouldn't hold that against him just to spite our face.