Let me put it this way: the Wii U is my most-played platform of 2019 entirely on the back of catching up on Mario Maker, and in this time I've only finished and uploaded one new stage.
If you'll pardon me for doing something a little lazy and crass, I'm just going to copy and paste
my answer to the same question from a different thread, as this gets asked all the time.
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Is Mario Maker worthwhile as a play-only experience?
The answer is
yes, but you have to tune the experience to your needs. In my experience, the players in SMM1 who just browsed aimlessly in-game or ran the random queue lost interest extremely quickly and never saw more than a fraction of what the game had to offer.
While SMM2 is improving a few of the discovery features (better search functionality, a better reason to play the random queue thanks to multiplayer ranks and medals, the redesign of the random queue as Endless Mode, adding a downvote button), playing in-game submissions from random strangers will
always be a messy experience because Mario Maker actually consists of many overlapping communities that have totally different priorities and value systems. If a creator is really into "don't press anything" automatic/music stages, and is constantly upvoted by other players who are really into automatic stages, no matter how good they are at what they do, you're not going to appreciate their work if you hate automatic stages. There are people all over Reddit and YouTube who, mystifyingly, are
really into self-described troll stages that are basically extended die-and-retry puzzles (hit the trap, avoid the trap). There are people who just slap an upvote on their favourite streamers and media figures no matter how incompetent their creations are (and I quickly learned to recognize when an exceptionally popular stage was loaded with stars not because it was playable, but because it came from some stupid quasi-comedy act like Game Grumps). And there are stages out there that are very well designed all around but aren't in your comfort zone as a player—in either direction, too easy or too hard. I admire many of the extremely technical Super Expert stages that are popular among a certain segment of Twitch, for instance, but I admire them as a viewer rather than someone who actually intends to play them, since I can't pull off basic Kaizo techniques like shell jumps.
So the best way to play Mario Maker, I've found, is to
find creators and communities who share your values as a player and who cater to what you most enjoy. For instance, I like lengthy stages with inventive mechanics, good spacing, optional exploration, and a difficulty close to or slightly above endgame Nintendo Mario (in SMM1, the sweet spot for me is a clear rate of 2-10%). And it wasn't hard at all—browsing here, the previous forum, Reddit, recommendations from mechanics-and-tricks YouTubers like Ceave, or community projects like
3YMM—to find exactly what I wanted. Part of why I've been playing so many Era SMM1 stages in the past few months has been to get a head start on figuring out who I really like around here as a level builder. Also, when you browse these communities, you tend to find people who put a lot of effort into packaging and presenting their creations to share with others, which usually indicates a high enough degree of personal investment that they likely put some effort into assembling the levels in the first place.
I've cleared the overwhelming proportion of SMM1 stages I've ever played because I quickly learned to avoid the random queue (100 Mario Challenge in SMM1) and go for a self-curated experience, so I've rarely ever skipped or abandoned anything for quality reasons. Being plugged into a good community goes a
long way in this game.
If you want conventional Nintendo-style Mario platforming, Era users are strongly biased in favour of them, at many different levels of difficulty, and the level of Mario knowledge around here is high enough that the majority of the SMM1 creations were at least clean and functional. (In fact, it might even be
too traditional around here, as relatively few users from GAF/Era stuck around in SMM1 long enough to play with a lot of the Maker-exclusive technical concepts I like to see—but there are a few people here who do that too, and are very good at it.)
Bad Maker stages are horrible. Great Maker stages are phenomenal. But it's on you to figure out what a great stage means to you, and to put in your own work to find the people or communities who focus on them.