It's a tough game to draw any conclusions from as the whole team were dogshit in the first half. He looked to struggle with both the pace and also having to change roles, which left him looking like someone who wasn't entirely comfortable out there.
BUT, I will say that the things that worry me most about him still concern me massively, despite the fact he's playing more often for us. His mobility and his lack of awareness of space and what's around him are a problem, IMHO. The most obvious example was around 38 minutes in when he laid off the ball to Evra who was faced up by their right winger and the full back behind him. Instead of looking to move into space he ran in behind the full back and stayed there, static, with the two players between himself and Evra, who had the ball. That forced Evra to play the ball backwards and we were forced to start again.
Players like Park and Berbatov have had plenty of criticism but watch how often they find space or make themselves available for a pass. It looks the simplest thing in the world but that awareness and footballing intelligence can make the game look an awful lot simpler. Watch how often we get bogged down in a tight midfield and suddenly Berbatov drops into the hole to take the ball into space and bring others in. Watch how often Park drifts into space that forces the full back into a position he's not comfortable in and allows players to use the space that he's created through intelligent movement. These are things that really matter at this level. They don't look much but they can be the difference between a stuttering performance and real fluency.
It doesn't seem like a big thing but Gibson doesn't seem to be able find space or to use his movement to cause problems well enough. It's much the same as the difficulty he has when runners from midfield go beyond him - he doesn't seem to instinctively know how or when to track them, or how to deal with clever movement. I personally think that when we're talking within the context of someone who needs to be good enough to start games for this club that he's lacking. He's a good player, but I reckon he'll prove to be just short of good enough. As an Irishman I really hope I'm proven wrong.