Sure, RM, MU and Barcelona are top teams, but if they don't win at least their country-leagues, they suck and everybody points at them and often their coaches, players and GM go (theres no room for 3 or 4 years of failure like in Boston ), due their payrolls and expectations. Mostly RM.
Well, I would say that the Premiere League (England) or the BBVA League (Spain) is like the WS in MLB
The Champions Legue is something else and goes beyond. Imagine a MLB-level at any country in europe (where the best leagues are). Then take the champion and the sub-champion of each country and put them in a tournament. That is the Champions League.
You can't find a MLB-LEVEL (organization, payrolls, players, etc) at any country outside the US. Maybe Japan but I doubt it.
Soccer is pretty different since it is the most popular sport around the world. You can find several high-level leagues around the world (equivalent to MLB ) like Italy, Spain, England, Germany, etc.
Hell, the "passion" (fanaticism I would call it that way) in Soccer have turned very bad last years. A lot people have died in the last decade at soccer games and in certain stadiums women and children and even fans from the visitors' team can't go there since the environment has turned insecure, mostly in Latin America. So... you can imagine the pressure on players, coaches and GMs by the fans and the media, even death threats had been in effect on them. I don't go anymore to stadiums.
I just follow MLB and soccer. I like NFL and NBA, but I'm not that expert but I like them. Collage football? I don't follow it, so many teams, I don't even understand the rules in order to make a bowl game, maybe someday you could explain it to me hehehe. Hokey?, I don't even understand the rules