RB Leipzig, Leverkusen, Wolfsburg, Shalke, all below the top 6 in the Bundesliga at present. And you suggest they're no better than us or other championship teams?
Is a player like Timo Werner not good enough for us then?
I'd take a Werner over anything we've got at present in a heartbeat!
The Bundesliga will always be dominated by Bayern, that goes without saying. Bayern have the financial clout that the others don't.
Those others still do quite well though regardless and the standard of football is better than you seem to think. I would say the German lower leagues are pretty strong too, probably as strong as ours easily. There are a lot of decent players plying their trade in the German lower leagues.