You can play as Green Ranger, like anything in this franchise with...according to Google, 26 different shows, it's the first series that gets the most characters because only the first series was a huge mega mainstream success.
Every other series, if it's represented, gets at the very best, 2 characters, 2 come from Street Fighter, one is from the MMPR movie which is essentially a reboot of the first series and MMPR has 8 characters, and 3 extra ones from the MMPR Comics including evil Green/White Ranger, kinda evil but reformed Pink Ranger, and some soldier guy that got Black Ranger's armor.
No Megazords...you can play as, you can call on them to assist but it's basically a giant limb or sword appearing out of nowhere to help, and Dragonzord is an option, much like the first Megazord...and giant Goldar...who were the only giant assists you could pick and all from the first series, patches added two extra ones that come from S.P.D and Samurai so at least there is that, though the upcoming DLC has an unique Megazord never seen in TV which is a fusion of the 2nd Zords shown in the MMPR series, so we come back to the first one.