Wade Barrett is a positive investment for the WWE, but with the word "so far", he's been neutral due to his injury. And no, I believe this is just his first injury in the WWE.
When I first saw him in WWE NXT, I was actually rooting for him to win mainly because I like his look. He won me over more when he showed that he could wrestle and talk. In fact, he was the only NXT Season 1 rookie, maybe even the only NXT rookie in history, who could actually talk. And it was a very pleasant surprise to me that he won the inaugural season, since he wasn't as over as Daniel Bryan.
He impressed me even more during his stint in leading the rest of the NXT Season 1 rookies as the Nexus, where the WWE should have given him the WWE Championship while he was hot, and although he was overthrown by the group, he immediately made a comeback in masterminding the Corre, despite it being less successful. After its disbandment, he still made an impact on his own with the Barrett Barrage (in case you didn't know, he initially introduced it as the "Barrett Uprising", which sounded better to me at first, but the former grew on me). Then, he got injured.
He was actually solid enough to get the fans to boo him and chant "Barrett Sucks" during his Nexus days and since he started flying solo, which means that he's doing his job well. But with him being sidelined for now, he's been neutral to the WWE at the very least. With the rumors that he's being pushed again and the fact that he's sporting a cool new look, expect more from him when he gets back.
For the WWE Superstar that I want to see you make one for next, The Miz please, especially since he's fresh after his Intercontinental Title win, making him the latest WWE Triple Crown Champion. I wanted to say CM Punk, but I figured that most people would say that he's already a positive investment.