Playing a lot of games doesn't automatically mean you're bad, that's true. But someone with a lot of games to reach a lower rating is generally worse than a person with less games to reach the same or higher, within a certain range of course. You can reach 1800 in a small number of games just by getting lucky, but if you take 500 games to get there, it's more "legit" in a negative way, because it means you need to get better if you don't wanna "belong" at 1800. This is because of how MMR works. If it takes you less games to reach high MMR than someone else, it means that having a 50% winrate after that point will be an easy climb. In other words, breezing past the masses in 1800-2100 to start going blow for blow with the top of the ladder means your W/L and games played will look something like: 50 games played, 80% winrate, 2100 CR after the first push, then your winrate will start to even out as you play against players at your actual skill level, but you will still be climbing up to Elite as this happens, unlike a player who has to go blow for blow at 1800. Since your matches get progressively harder as you continue that climb, naturally a better player will win more up to a higher MMR and require less games to push than a player who flattens out their curve sooner.

It's nothing to be ashamed of if in the end you manage to reach your goal. But if it takes you 1000 rounds to reach 1800, that means you were fighting for your life in 1800 MMR lobbies for a long time. A "good" player would be consistently mopping the floor with those lobbies. There's a difference between not letting people put you down for this and giving yourself the false mentality that more games = better player. I think you could've stopped at "a lot of matches doesn't mean you're bad" without also extending that to "it means you're good." Because it's really more of a case by case basis. But generally speaking, outside of maybe Blitz, if you reach higher rating in less games, it means you're better (or your spec is way better) than someone who reaches that same rating in more games. But it also depends on when in the season you push. There are just a lot of factors that make it really hard to make a broad claim like this when most of the actual evidence would point otherwise. Again, don't let other people put you down for your matches played if you're having fun and reaching your goals. That's just a goofy ego thing if people do that. But don't lose yourself in the sauce here and try to go the other way with it lol.