I do agree that some complaints seem overstated. Repetition-related tasks frustrations are something I've noticed in a few reviews, but those kinds of things are endemic to the genre. As are getting items with bad rolls when a system relies heavily on RNG. Just comes with the territory but is definitely noted as a negative. Also, you'd like to think that someone would have put enough time into the game to know how to do combos. Whether the game explicitly explains them or not, I'd like to think a good reviewer would do the necessary due diligence to have learned how that works at some point before tendering a final review.
That being said, whether the repetition feels bad or not is generally a function of the core gameplay loop (overall engagement and design). If enemies aren't interesting to fight, repetition will begin to feel tiresome and frustrating within a few days. One of Destiny 2's saving graces, IMO, is that enemies tend to be pretty unique in how they fight and the best ways to kill them. As such, you can play Destiny 2 for a thousand hours and not get terribly tired of repetitious activities like Public Events and raids. Same goes for something like Path of Exile, while Diablo 3 succeeds by having massive swarms of enemies which keeps it all entertaining. After the demo, I can't say I got the impression that many enemies *felt* different to fight and there wasn't the quantity of them to make up for that lack of design quality. I mean, sure you had the annoying snipers, the annoying guys with shields, the occasional enemy Storm type character, and the annoying flying guys with miniguns. But everyone else felt the same and were dispatched the same way. Not much in the way of AI intelligence. That could be a major problem for this game and how much time a player can expect to get out of the game before it feels grating.
Also, the complaints about the bugs I've watched should have been ready as a patch on the 15th when the game came out, not on the 22nd. If the game wasn't going to be in a proper state on the 15th, it shouldn't have released on the 15th. Whether this big upcoming patch fixes some of the massive issues I've watched and read about (audio cutting out, people not being able to see or hear critical cut-scenes, not being able to complete missions because targets get stuck in walls and you literally cannot progress, people dropping through geometry, 95% bugs, etc) remains to be seen.
Xbox leadership commenting in this fashion is not only disappointing, but it makes me worry about the brand as a whole. This cannot be the kind of mentality driving decision-making at Xbox if their goal is to do better than they've been doing. Blaming players and reviewers for having poor opinions of the game is unacceptable. If feedback is negative and commonly negative at that, the response isn't to say the players are wrong.