It wasn't really over the top - just that he needs more composure. In general, yes, I am not a fan. I have not been impressed with his passing, composure, vision, or touch for someone so highly touted and expensive and having an impressive beginning in Germany.
I expected a great deal more and really just of the simple stuff, not anything outrageous in terms of offensive contribution or dictating play, etc.
Anyway, my judgment isn't really hate - it is incredibly hard to meet the standard of a top player at Arsenal - we have had loads of decent players who didn't really hit that standard. I hope Xhaka does, but I am not betting on it atm.