Honestly, the only guy I was terribly impressed by in summer league was Queta. I see him as a potential breakthrough rotation guy until KP returns. Last year, he displayed an ability to change games that most third-string guys don't possess. If the consistency improves, he can help us.
Springer had a very good game against the Heat and didn't play otherwise. Hard to take much from one game.
Scheierman and Watson both see the court well, and I generally trust Scheierman's shooting ability even if the results were mixed in the summer league, but both have significant footspeed issues that they'll have to overcome in the league.
Nobody else caught my eye really. First time I've ever seen Walsh hunt his own shot like this and the results were ghastly. Davison isn't dangerous enough offensively to overcome his negative defensive value. Peterson was disappointing, though I actually like his skillset (he isn't the Hauser clone this board apparently thinks he is - if anything, his lack of an elite outside shot is one of the things holding him back). Ramsey shot well, but I don't put a lot of value on microwave guards getting hot in the summer league - odds are high he'll never have that kind of green light in a real game. House, Harper, Tillie, bzzzt.