think the best answer to this question is Champions Legue. Look at the past 3 years. 3 Premire League teams manage to qualify for the semi finals in the past 3 years. Other English team lost playing against another English team. That speaks volums. Furthermore there has been a Premire League finalist in the last 5 years or so. La Liga cannot boast like that. Only Barcelona showed that they can compete with English teams. As far as RM goes. Lets see what will happen next season. Don't forget that they last won the CL in 2003 when there was no player with European Player of the year. Since then they had at least 1 winner of the medal but never won the CL. Hope the trend continue!
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People need to stop thinking that the top four teams in the EPL represent the whole league. During the 1990s the only teams to play real football in the epl was utd and ***-naaal.
Now we have four teams that are will to play the game. all the rest are just trash. they could not string 5 passes together. they are long ball merchants and thugs the whole lot of them.
Until every body trys to play football they can not be compared.