Any club that has advanced this far has no reason to underestimate them, and I believe Aston Villa can still give PSG a tough fight. Although so far Aston Villa have not been able to show that they are better than Liverpool, that is not a benchmark to say that PSG will be easy to beat Aston Villa. Because this is the last 8 and all teams have enough time to prepare it means that everything is still possible including the threat that Aston Villa will give later.
No team has made it to the last eight without proving their worth. No team should be underestimated in the last eight quarter-finals. Every team has the ability to beat every team and has the ability to fight hard. Losing and winning are part of the game, so any four teams will be eliminated in the last eight. So if you think that the four teams that were eliminated were weak or they are not worthy of fighting, then you would be wrong. Because every team has an equal chance of winning.
Aston Villa is not a team that PSG will not care about. On the contrary, their fight with PSG will be even more difficult. PSG will have a harder time against Aston Villa than the difficult time they had against Liverpool. I can't put anyone ahead of PSG and Aston Villa. I think both teams should be evaluated equally.