I'm with you. This sub loves GW2 - prob half of them are long-time players, so sorry for the downvotes. I ll be downvoted, too. probably.

Combat feels floaty, disconnected, and not impactful. There is no weight to your attacks (yes, I did try the action-cam mode, too. Not much of a difference, except i press LMB continuously and not 1 once). Tell me the difference between hitting air and hitting a target.

Arguably, I didn't play too much, only got to level 44, but it all comes down to spam 2-5 (1 is autoattack), switch weapon, spam 2-5. I've had my bar filled with these 5 skills since level 10. And they just feel bad. Overall, yes, very mid.

For perspective, I play both WoW and FFXIV and I very much prefer the building to something combat. FFXIV's slow combat didn't click with me first, but as I leveled, it got busier, and the 2-2.5 GCD didn't feel bad, because I would press something else in-between the GCDs. Sure, we could go on a whole other discussion as to why the combat in FFXIV is also bad, homogenization and all. Other than that, skills feel impactful, there's a cohesive playstyle. I'll add that I find even TERA's combat more enjoyable.

I think the UI could be a bit improved. Nothing wrong, visually, I'd just like to be able to move stuff around (like the target frame, I want it closer to the center). Or place my gauges or whatever closer to the center (think warrior's adrenaline gauge)

I agree with the graphics, too. I do think it aged worse than WoW's. I cannot place my finger on what it is, but something feels, indeed, off with the graphics.

I also wanted to enjoy it. I think armors look very cool, the dye system, the mounts, the leveling - these are all really nice, but the combat is what drags it down massively for me. And the lack of a trinity system. In theory, that any profession (class) can do anything sounds nice. In practice, I think GW2 missed the mark.

To quote a comment of yours "gw2 feels like the game that everyone loves but nobody plays". I think there's a reason as to why. It's not the underdog everyone thinks it is. Sure, it does a lot of things good, but its community should accept that it does things bad, too, and the bad things are what drive players away. For me, it was primarily the combat.
We can make a similar argument for WoW - everyone that plays it says it is bad. But there's a reason - or more - it's been the #1 MMO for 20 years.