This tie is a 50/50 IMO. Could go either way.
And I think that suits Barca tbh. Their players usually do well when they don't have the favorites tag and when people doubt them. See the 4-0 against Milan. Or Spain's 4-0 against Italy in the Euro final after being fairly underwhelming for most of the competition (especially against Portugal).
And those of you saying that Barca barely got past PSG, don't forget that Messi was out for most of the tie. How they did against PSG without Messi has **** all to do with how they will do against Bayern with Messi playing. Just like how Bayern's performance in the second leg against Arsenal without Schweinsteiger and Ribery has **** all to do with how they will do against Barca, because Schweinsteiger and Ribery will be playing.
Like I said, this is a 50/50 tie IMO. No clear favorites. Anyone who thinks that Bayern will steamroll Barca is underestimating Barca, and vice-versa.