Leverkusen yes, but I don't see Roma being on the same level. In my opinion Roma is not even close. They improved their game lately, but there is still a huge gap when you compare them to Liverpool. But I think we will get to see a nice test when Liverpool now plays against Manchester City. That's the toughest test a team can have.
However, I think in a final everything is possible. If Roma can manage to make it into the final, then I wouldn't assume that they are without chances. Playing a final is always different from playing league games.
I agree with you. AS Roma is still far from the level of Liverpool and Leverkusen. AS Roma still can't prove that they already become a stronger and solid team. Most the matches that AS Roma won, were easy matches. Most of them were playing against average or small teams. We only can assume AS Roma to have the chance beating Liverpool or Leverkusen if AS Roma can beat Milan, Juventus, or Inter in Serie A.
For the final match, it is still difficult to predict. However, I'm sure the ideal final match should be for the favorite teams. Liverpool, Leverkusen, and AC Milan look like the favorite teams in UEL. I think the final match should be among these teams.