Fluked, bossed, once in a hundred kind of game is all hyperbole and largely irrelevant in the grand scheme of things. We won the game because we scored more goals than they did and that's the only thing history will remember. This United side under Jose has a habit of scoring late goals. Some even believe it's a strategy, as crazy as it sounds, but who I am to doubt CAF wisdom.
PSG would most certainly be considered favourites for the tie, but to suggest they would be overwhelmingly so is a tad extreme. Jose Mourinho teams are notoriously difficult to beat, particularly in European games, he would set the team up not to lose; swamp the midfield, dug in, close space, bully the opposition etc - it's the only thing he is remotely competent at these days. Napoli would be 50-50 in my opinion.
The best they can hope for is second place and you win nothing finishing second. Liverpool hasn't won a league title in 30 years, second place for them is simply not good enough. Don't let the Liverpool fans on this board fool you, most scousers are desperate to win the league first and foremost - at least the ones I know are.