To be fair to him I not sure 1 out of 10 appearances have been decent, more that he's strung together a number of decent outings as of late and improved over his previous form. I know he did not do a lot on Sunday, but then again not many in the side did, so to single him out might be a bit rough.
Also like most wingers I think who plays behind him has a huge impact. With Johnson behind him always a threat to cut inside or overlap on the outside he looks a much trickier customer. But with Wisdom who does not go forward as naturally as Glen he's much more often in a one on one situation, plus has to do a lot more tracking back.
However I do think it’s highly likely he'll be off in the summer, with more quality options coming in or coming up. Who knows maybe he'll end up back at Boro if they manage to get promotion, which I think would keep everyone happy. But I won't have a go at him too much other than to say he is what he is, a decent player for his level , which is in a top half club, but not necessarily a club that has aspirations for more than just the top half.