It's had the highest opening weekend out of all the blockbusters so far, and criticisms, both professional and public, seem to be in the 70/30 range, just like it seems to be with most of the fandom. I go on Tumblr and search Godzilla and see floods of "it was awesome!" and a few negative comments. Same on IMDb. Rotten Tomato's forums are kind of negative. 4chan, the den of mean-spirited criticism, seems mostly positive. I'd say the film's legacy will be much better than GINO.
And I think it's safe to say it's a success. It's made a crapload of money and it's not done with the international markets. We'll be getting our sequels.
What makes me wonder is how they're going to handle the promotion for the second one. They can't pull the same sneaky advertising, making it look like a much darker and moody film than it really was. Unless, of course, the next film DOES take a turn for the darker. But in that case, if they advertise it like that, nobody will believe it.
I also think it would behoove Legendary to cast somebody with the same type of draw as Bryan Cranston, whoever that may be.