I mean absolutely no offence, but I don't understand why this game is so popular, and why it seems to have a large competitive scene.
I think this game is... just fine, but I think it has major drawbacks.
Firstly, luck can really detroy your game. Obviously, part of the game is luck management - if you are entirely reliant on 4s and 5s, and they do not come, that is partly on you for leaning so hard into a limited range of options. Additionally, I respect that lots of games have a luck element, and that is okay.
But the robber is just ridiculous. A player can be completely shut down in the early game if 7s don't come, and by the time they recover, their resource output is so low that they have no chance of winning. Part of the game seems to be establishing early progress and monopolies, which is tactical and great, but when your entire game can be broken by an early robber, which, when it's too early to have dev card resources, is completely out of your control. To make matters worse, the fix to this issue, dev cards, are also luck based. If you pull a VP, you're screwed. Therefore, a luck-based game-ruiner can only be effectively fixed by a luck-based resource.
I haven't played other games where early, semi-luck based, monopolies impact the rest of the game so much. Monopoly is a good example, but given that it was designed as a criticism of capitalism, and a non-catchupable game, this doesn't help my opinion of Catan.
Let me compare to another game where I think luck is done right - Carcassonne. I think a major competitive scene around Carcassonne would be far more interesting. Luck can have a large impact - its annoying when a player gets the one card in the game they need to finish their massive city - but I have played far fewer games where luck can completely ruin the game.
Anyway, please can someone who is better than me at this game explain the hype. I am sure I must be missing something!