His crossing with his left foot is not as good as his right which is expected as he's a RB. Was dispossessed many times but mostly recovered quickly. Hopefully he'll learn from his mistakes. Will be a key player next season.
About him being a key player next season, how do you figure that? There seems to be no slowing down Dani on the right, and Alba will dominate the left. This season is the one where people said that Montoya would start rotating regularly with Dani, but that has obviously not happened yet, and I honestly don't see it happening next season either, with Dani clearly still being so enormously important to us.
I think Montoya will at least rotate regularly with Alves next season.