I'm amazed so many seem to have written him off already, can't say I've really seen sufficient of him to form an opinion.
It's difficult to get into a game coming on for late cameos here and there, so hard to judge him. You're looking to get upto the speed of the game really quickly and often players coming on as a sub in such situations can try a bit too hard, and I think that's partly how he came to injure himself at QPR.
The goal against Cardiff was well taken and that was around the time of his most promising looking spell of form for the club which coincided with him getting the most game time (I'm going off memory here rather than stats so I could be wrong). Some players need a series of consistent starts in matches to bed in and show their worth.
Personally I think with a full pre-season he's got a good chance to stake a claim for a place as he came with a good pedigree. If Wilder (who has seen more than any of us with daily training) thinks differently and moves him on I'd back the manager's judgement, but I'd like to think he'll be given more of a chance next season. Many foreign imports improve in their second season as they become more accustomed to their new environment.