There is no other hobby - there is
ONLY Transformers! Transformers izzz llllliiiiiifffee!
Ralph: I think people can say whatever they want. I think that the key thing to being a good reviewer all lies in how your present or justify your opinion, although there is greater onus if your opinion sways against the general consensus.
e.g. a person may come along and say that IDW's G1 is complete and utter garbage - that's perfectly fine, but as the majority of fans think that it's really good and you are presenting a view that flies against the consensus, then you are obligated to defend that view.
But there's no such thing as a right or wrong opinion, unless that opinion is based on inaccurate facts
e.g.
"I think that The Empire Strikes Back is the best Star Wars movie." - most people agree with this so you can quickly state this without needing to go into detail to explain yourself.
"I think that The Empire Strikes Back is the worst Star Wars movie." - okay, you're entitled to that opinion, but as many people would disagree with you you'd better be prepared to back yourself up.
"I think that watching the Empire Strikes Back causes autism." - this is just plain wrong.