Is Gareth Edwards Godzilla too big?

no. it depends on how far one is willing to stretch their imagination.imo.

"Some audiences find the plausability of such monster movies a stretch too far"

Says who? What is this based on?

Also, Godzilla in the 1954 original classic, Gojira, was 50 meters tall, or about 165 feet, not just under 100. 

"making these monsters ever bigger is likely turning away prospective audiences that could otherwise have become new fans of this legendary form of Japanese cinema."

With great size comes mass and power. The kaiju in Godzilla and Godzilla 2018 are, and will be, not only actual creatures, but they are symbols of other fears and forces.

I found Godzilla in the 2014 film to be just about the right size, especially given the surroundings he was in: the Pacific Ocean, San Francisco, along side the Golden Gate Bridge.

While I disagree that the massive size of these beasts are putting off audiences (I doubt general audiences take much notice), I think the larger monsters work better in American productions from a visual standpoint.

Japan's effects work with kaiju is best represented when the monsters are at a smaller scale. This leads to more detailed, larger and more convincing miniature work. It's the quality of these miniatures that make these monsters look like they're really in the city. Comparing the set work from Godzilla vs. Mothra '92 to Gamera: Guardian of the Universe is a great example of this. Some of that could be chalked up to the talent of both films' effects directors, but Gamera's visuals were stronger due to smaller scale monsters surrounded by far more detailed, upscaled miniature work.

With American productions, I feel like it's easier to conceal these details through CG if the monsters are larger. Depending on the shot these massive kaiju could mean less attention to the smaller details necessary in tokusatsu.

A lot of this is a fairly vague observation, granted, but the differences in what's most effective for both Hollywood's representational style and Japan's tokusatsu seem to ring true.

We don't know how big Kong is going to be this time yet. We can't say Godzilla is too big until we know how big Kong is. In 1962, King Kong was made 50 meters to match Godzilla's height. Kong will be big enough to fight Godzilla. If he's a few meters short, it won't matter. As long as Godzilla and Kong are close in size to one another, then it's all good. Just let them fight.

It hasn't hurt Godzilla, as much as possibly hitting kong story wise. Kong has always been strongest as a character when paired with a human. The larger a monster gets the more it strays away from its interactions from humans. The interactions of Godzilla and the Muto with Ford were pretty much the most you could have. They'll have to make Kong a lot smaller, or possibly younger in his solo movie which takes place in the 70 so maybe they can pull something out

as for the chart dipiction above... 2014 G was 108 meters tall and shin gojira is 115 meters tall. so the chart should be updated. imo.

"Says who? What is this based on?"-Jamaal

I've seen many people in comments say that a Kong beefed up to Legendary Godzilla's size would be ridiculous.

he's 355 ft.  The size of about 3.5 blue whales.  Kong is normally 25 ft, btw.