Liverpool deserves what they got for taking the first leg match for granted. They thought that PSG is a club in EPL and that made them feel winning will be easy and they will qualify to the quarter finals. The match went in a different direction for Liverpool and they fought till the end but couldn't make it.
Liverpool should concentrate on English competitions and prepare for next season in UCL. PSG was been criticized in the beginning.
This defeat was not because Liverpool underestimated PSG, but PSG's performance was quite good from the two legs that had been played so it was appropriate if PSG could win the match and advance to the quarter-finals.
Since the first leg, even though Liverpool won the match, sometimes PSG, but in terms of game quality, PSG was clearly slightly better so there was no gap for Liverpool to win this match, that must be admitted and Liverpool's defeat was because their quality was not better than PSG.