Tbh I genuinely think - on the basis of those two games, mind - that Bilbao are on the same sort of level as Man Utd. Certainly technically, Bilbao are on another level. Maybe Man Utd's grit and Englishness could get them a few more points over the course of the season.
On the basis of those 2 games (...and I don't think Man Utd gave up at any point - they were just completely outplayed), Bilbao would be right up there on our league. But obviously it's not fair to judge them on those two games only - maybe they did put extra efforts into that. Hard to tell. The point was though that there do seem to be some very good teams in Spain. The fact that Barca and Real Madrid are so clear is probably more a reflection of their quality rather than the chasing pack.