I'm not the guy but I think the multiverse is bad,

It doesn't seem like you're rebutting their actual argument to me... They're not talking about the movie in a general sense, they're referring to its effects on writing.

Your first point doesn't appear to me to relate to the quote. It doesn't say you're making up stuff, just that there's little info. Second point is kinda odd sounding to me. They're talking about the movie's effect on fan fiction.

...if they make "movies" outta stuff that we never had much info about, what's that do to the writers? It dampends the feel of writing.

Part of writing is the great opportunity to make the imagery of a story out of nothing, and use your vision of an area or character in it. It's all completely your own, in particular, when you're writing about topics with very little info, or that have never been solidly formed in a video/picture. Once something exists in a physically visible sense, you can't really write about it when whatever you came up with is so much different.

Sort of a larger version of going to watch a movie based on a book you read, and everything looking nothing like you thought it would.

As for your third point, it looks more like just some catchy slogan-ish thing to end a statement with. Though the person in question might consider the Multiverse bad, I don't know. Certainly a harsh generalization though, which seems to work against the rest of the quote. I agree with you there.

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I don't pretend to talk on behalf of whoever wrote that. I don't even know who said person is. That's just my take on it.

Personally, I think this movie is an interesting concept. If it gets pulled off, it'll likely be really awesome. It'll take a whole lot of work though...

EDIT: Wow... that came out bigger than I expected. O.o

Plus, It's MY job to make sure it follows the canon. Talk to Legolover. He's had to rethink the Tuma vs. Mata Nui battle several times because I kept telling him his ideas weren't canon. So, I say to this person that there are others out there that are making sure that Next Generation stays true to the great world we all love!!

Toa Phoenix

is (always) on duty