Dude, this is a ridiculous standard. Let me attach it to other things.
- Think this song sucks? I'd like to see you compose/play a better one!
- Think this painting sucks? Get out your paint brush!
- Think that football play was done terribly? Get onto the field and show us what you can do!
Basically, it completely and totally eliminates the ability to critique basically anything. It completely invalidates the feelings that anyone - other than the creator or performer - has about any work unless they are also capable of doing the act in question. Might as well just fold up the forum entirely as well.
I'm also not a hater. I rated this episode a 7. I spoke to some of the strengths. I've enjoyed the season overall. When it comes down to it, I'm just a highly critical person when it comes to artistic works, even of things I like. I enjoy tearing them apart and analyzing them. There's only so many ways you can say "that was awesome" after all, while discussing the faults of something can lead to pretty lengthy essays - and is ultimately much more fun.