Okeydokey. I shall attempt to enlighten you, Malicious.
For European leagues, the big ones are the Premiere League (UK), Bundesliga (Germany), and La Liga (Spain). Each of them are strong, have loads of money going in/out, and each play a little differently. BPL is pushed along by a strong lower league system and promotion/relegation resulting in dynamic seasons with different teams each time, Bundesliga has an amazing fanbase and fast, pressing style of play, and La Liga has no defense and spectacular players (Messi, Ronaldo, Xavi, Falcao, to name a few). Each have a different style and fanbase, and each year they all come together and field their top teams for the Champions League (which is how you get games like Bayern Munich vs. Chelsea last year).
As far as over here there's multiple South American leagues (Brasil has the strongest), and then Liga MX (Mexican) and MLS (American/Canadian). They're not on the same level as overseas by any stretch of the imagination, but fans are passionate, games are good, and when some of them come together (CONCACAF Champions League, takes inspiration from European Champs League) it makes for some interesting intra-country games.
That's all I've got, and I may have totally missed the point, but whatever. I'm most excited about MLS starting back up since supporting the BPL team I do is like pulling teeth sometimes, and I no longer have to wake up at 8AM to catch live games. Also go Germany or something I guess. Not that they're doing any more than playing friendlies right now.