I have to admit that I'm a little tired of the "it's fantasy, so no rules apply" excuse. Sorry, but that does not fly. Certain rules need to apply
within a narrative. Otherwise, things may very well become extremely silly.
For example: if fantasy means "anything goes", what is keeping Jon Snow from using "magic" to spawn a couple hundred AT-ATs - and a dozen Star Destroyers for good measure - to blast those White Walkers to smithereens? People in GoT are using magic all the time, don't they? And there are Dragons, aren't there? Since both of these don't exist in the real world, every other thing that also does not exist therefore has exactly the same merit for the story, right?
Every story, whether it's fantasy or a docu-drama, needs to be conceivable. And pointing out inconsistencies, plot holes, or when the plot jumped the shark is, IMO, valid criticism.
Regarding Red Letter Media:
Doing an in-depth, well-researched analysis - especially if you know what you are talking about, like the guys from RLM - is most certainly
not trolling! Anyone who can't stomach valid, spot-on and well-presented criticism of "their" favorite trilogy should probably refrain from watching such criticism. Really.... feeling "trolled" by movie critics?