I want Gibson gone as much as the next man, but his issues have never been about his ability
When Moyes was here, Gibson was pretty much excellent for about 18 months
It's only since Moyes left, Martinez came in and brought McCarthy and Barry with him, that Gibson became a 2nd choice player. At that point it went all downhill for him. He got injured a lot (as happened at United when he wasn't playing) and the rumours about his liking for a pint got more and more frequent, culminating in that drink-driving incident.
If someone gets Gibson fit and motivated, they have a really good midfielder - he's 10 times the player Rodwell has ever been, for example. The catch is that nobody other than Moyes in Gibson's career has had him consistently fit and motivated. Could be a good fit, worth a gamble on their part, but realistically it was bonkers of us to give him that new contract last summer.