Luftstalag14
Culé de Celestial Empire
What happens in Bundesliga is irrelevant to Champions League. No team in Bundesliga except Bayern is good enough to even pass the last 16 in CL. Meeting Barcelona or Real Madrid is much tougher than anything Bayern can experience in Bundesliga.
I'd say Bayern with the best squad available is on par with Barcelona and Madrid. That being said, they still lack a player like Messi and Ronaldo. A great team, but one without a generational player.
But football is a team sport and that's what makes Bayern fearsome, that they don't just rely on one or two players to score a boat load of goals for them, their attack is pretty balanced. Of course they will feel the impact if one of their star players (such as Robben) is out, but not remotely close to what we and Madrid will have to cope if we don't have Messi or Ronaldo.