Could we have done better? Yes, absolutely. But to say we had a miserable transfer window, or to even call cor Marotta's head goes way too far. Not really referring to you with the last part btw, I think your assessment is rather fair actually.
The broader picture can be criticised, but I find it hard to do so convincingly when basically every transfer of the summer makes sense in its own
We desperately needed backup at CM -> Pereyra, who can moreover deputise at AM and if need be winger as well
If we want to move to a back four (one of the strongest demands of the forum since ever btw), we need cover at the fullback positions -> Romulo & Evra
In both cases, details can certainly be criticised, for example the greatest mistake of Marotta in my books during the past few years was not signing Nainggolian, who, for roughly the same price, would've provided more quality than Pereyra. I'm not the biggest fan of Evra either, but on the other hand I fail to see any alternative affordable player who we could've gotten.
Morata now is a different case, which in my opinion actually disproves the mantra of Marotta always being too conservative. His acquisition was defenitely a risk. On the other hand, he's exactly the type of player Marotta's critics always wanted us to get: Young, talented, with worldclass potential. His buyback clause is cause for concern, but there's also enough reason to believe it's more a formality than anything else.