Difficult as it must be sometimes, people who post on here and encounter non-constructive criticism should just mentally put it to one side.
I say this from people who make projects like Ady all the way down to people who post a few times with suggestions and mockups.
People who moan about a project they aren't contributing to taking 'too long' doesn't constitute constructive criticism and should be ignored or if you like taken as a complement. People were so impressed by your previous work they want more fast.
It shouldn't be a cause for feeling pressured.
If you read something that doesn't help you get to where you want to go at a pace you are comfortable with, it wasn't written, you just dreamt it.
As for Ady's approach to doing the PT:R, it makes sense.
It follows the pattern that Jackson used for filming the Lord Of The Rings Extended Cuts and it allows enough room for fine tweaking each episode after filming the new elements has been initially completed.
The PT live action feels more uniform than the OT so it should be easier to asset strip and reshuffle the old footage and carried over elements with new footage than with the first three films (and the first two are pretty close to perfection anyway story, performance and direction wise so they wouldn't need that sort of massive restructuring anyway).