So finished this over the weekend, my only platinum ever (and probably the last) because just playing the games gives you the platinum lol, only extra thing i had to do was to unlock all weapons for all characters.
The story is very good, a little cliché by the end but I enjoyed it a lot, just by chance i left Gouto to the end cus' i don't like him, but it was a good thing, as he's mister spoiler, lol.
My only disappointed with the game is that the combat requires too much micromanagement for being a RTS with pause (or something), like if you don't select an action your character doesn't do anything, and when is your turn basically the time stops during your attack so you get a super advantage over the enemy, i wish there were more ways to automatize it a bit, also most anti air weapons are pretty much useless, as just some missiles or EMP kills all (at least all the main ones in normal difficulty, didn't play the 4th area yet), so the game doesn't push you to experiment with other kind of weapons. My 2th generation sentinels where turrets spammers, the 4th basically all missiles and leg attack on the big kaijus, and the 1st gen did all the massive damage where needed.
Overall I really really enjoyed it, one strong GOTY contender.