I agree Pele's competition wasn't the same as today. But you also forget that Spanish football today is very skewed. Messi DOES NOT play against top notch teams week in, week out.
It's still incredible scoring 86+ goals, and I won't lie, he still shows up in big CL & El Classico matches. But Messi probably has about 10 real matches a season, the rest are just formalities.
LOL @ this perspective. Yeah, La Liga is garbage, except...
-It is the strongest league in Europe according to the coefficient.
-Teams like Athletic and Atletico have destroyed United and Chelsea respectively in recent months.
-Spanish players come over to England and become the best players in the league (Mata, Cazorla, Silva, Alonso, Torres, etc.). 2 million rated no-names like Michu come over and lead the EPL in scoring into mid December.
-Spanish teams have performed best in Europe in recent years. 5/8 European semifinalists last season (CL and Europa). Four more into the CL knockout stage this season.
-Top to bottom, it is the most technical league in Europe, and in today's game technique will usually win out over punt&chase sides, physical sides, defensive teams, etc.
So yes, to the ignorant/casual observer it may seem like just because Madrid and Barca are so dominant, the rest of the league must be ****, but it's just not true. The big two are just that good, and the only other side in Europe really on their level is Bayern. Dudes need to start recognizing.