I think its fine to rationally critique a game from previews since that is really all we have to go by. But how we define a legit critique vs an irrational critique is something we may have to agree to disagree on.
I don't see "too many cut scenes" as a rational critique at this stage since we don't yet know what the actual % breakdown on gameplay vs cut scenes is going to look like. RAD wouldn't be the first company to be guilty of showing spiffy looking CGI or in-game cut scenes to generate a little "oooooh look at the pretty graphics" hype. And who can blame them? Although that doesn't generally fly on GAF, the truth is most mainstream gamers are graphics whores to various degrees. Pretty graphics sells games. So, my response to this critique is take a wait and see.
The QTE complaint is legitimate if it is truly overdone, but at this point we don't know how that's going to play out in final gameplay. Ryse justifiably got destroyed for this in early impressions but the final product was much better and much more fun than many give it credit for. From what I understand, a lot of the early negative feedback helped the devs modify the gameplay. And thats why I actually think rational critiques are a good thing because that early feedback can sometimes help devs come out with a better final product.
You'll have to define "lack of player agency" since I'm not sure what you're referring to.
In any case, even if for the sake of reasoned debate I were to agree with you that all 3 of your listed critiques are legitimate, none of them individually or together justify the over-the-top hate this game seems to be getting. So far it looks like a beautiful Gears clone with some fun couch co-op. I have the Special Edition on pre-order thru Best Buy at the moment (took advantage of a price mistake to get it for $48) and so far don't see any reason to cancel it. It might not be a 10/10 and it may not be worth full price for many frugal buyers...but so far it looks like a fun game and a worthy addition to any gamer's library at a post-release discount price of $30-$40 or so. The way many people are reacting is like its shovel-ware that isn't going to be worth more than $5 in the bargain bin, which is straight ridiculous. There is nothing so far which indicates this game is going to be a "disaster", even if it doesn't live up to people's expectations.