By watching football.
Their squad is full of internationals and players who have won championships all across Europe. They clearly aren't bang average or crap.
Is it?
Heaton - 3rd/ 4th choice for England, 3 caps, 1x promotion from EFL Championship
Mings - Jury's out, 3 caps, 1x promotion from the EFL Championship
Engels - no senior caps, Belgian title (only made 10 appearances during campaign)
Konsa - no senior caps, no championships
Hause - no senior caps, 1x promotion from EFL Championship
Guilbert - no senior caps, no championships
Luiz - 1 senior cap, no championships
Nakamba - 18 caps for Zimbabwe, 1x Belgian league title
Targett - no senior caps, 1x promotion from EFL Championship
El Ghazi - 2 senior caps, 1x promtion from EFL Championship
Samatta - most successful, Belgian league title, league titles in the Congo, 56 caps for Tanzania
Grealish - no senior caps, 1x promotion from EFL Championship
Drinkwater - 3 caps, Premier League title and an FA Cup but now a busted flush
Not many more if any European championships amongst their subs. Pepe Reina obviously has a few medals, Wesley has a couple of Belgian ones but isn't up to much in the Prem.
Don't know how you can watch Villa and think they're good. They have good moments, but they're far outweighed by bad moments. Face 20 shots against them a game, worst goals against in the league.