Barcelona are actually quite heavy favourites for winning the Champion's League at the moment, which surprises me.
As others have said, other than Messi having a good performance I really don't think this Barca side is that good. Of course they're still excellent and in the top five teams in Europe, but even from the remaining teams in the competition there are at least three better IMO. If they do give us a bit of a thumping tonight then I'll have to eat the humble pie, but I expect another tight game and if Barca go through I think Liverpool will knock them out without a massive struggle.