Luke looks like a legit major league starter to me. And he is cheap.
I could easily see him be a guy that hits .280, with a .380 OBP, and slug around .500. Say 25-30 homers and 90+ RBI's. I really like Luke and hope he gets 100% healthy. What he showed the second half last year was an even better pace than that. I hope he gets a continued chance with the Astros.
And, maybe it's just me, but he has also had a little bit of bad luck this year (notwithstanding his injuries). He has smoked a few outs.