Yeah I'm very very late to the party, but I finally got a chance to watch the movie and here is my review:
It was good. It was better than the first two Power Rangers movies from the 90s. The plot was competent, characters were fleshed out and likable. The suit designs are cool. The zords, while looking like complete garbage as a Bandai toy, the cgi in the film was good. I still do not like the Megazord design but ehhh its ok.
Elizabeth Banks did a great job as Rita, it was so much fun seeing her going all crazy. Alpha 5 was good too and less annoying than the original one. I loved the little references, including the JDF, AJJ cameos, the zords running scene and hearing the 1995 cover of the theme song!
CONS: The cow joke at the beginning was trash and should of been taken out because it was not funny at all. Language was surprisingly tame for a pg-13 movies nowadays. Zordon was a bit of a dick in this film, they didn't give him the wise supporting mentor personality and instead was a discouraging almost asshole type guy. No action scenes until the last 20 minutes of the movie, which is surprising for a typical pg-13 scfi action movie that tries to cater to a wide range of audiences. NO BULK AND SKULL!!!
Overall the movie was fine, they played it safe with everything and dropped a lot of hints for future sequels that may or may not come. I was surprised that this movie only made 140.2 million. I was expecting Ninja Turtle numbers.