Godzilla '14 is eerily similar to Vs. Redmoon. To be fair, though, the mating and male/female monsters concept is something of a trope these days, so it's not too surprising, and is probably a coincidence. However, I wouldn't put it past the Director to slip these similarities in as easter-eggs themselves.
From what I've read of the plot, it seems fairly strong. The idea of a male and female Kaiju was not common at the time of production, and the anguish of Hafun's death seems like it would have made for a very realistic message about Mankind's treatment of its Animal neighbors. Godzilla seemed noticeably shoehorned into the plot, and it seems like his role would have significantly confused said message. Perhaps the lesson was leaned, but there was still the reality of the destruction being caused, causing the need for Godzilla's help. I also assume that there would have been more minor connections to Godzilla throughout the film, similarly to Vs. Megalon, instead of him just showing up. What is known of the Monster's look is very unfitting, though I'd bet the suits were heavily reworked for their final film.
I wouldn't have minded this movie coming to fruition, though I can't say there's a massive loss without it. Plus, at least we do have G14 to give us an idea of what we missed.