If you actually watched the giant robots fight giant monsters movie for the plot and the dialogue, then perhaps you're not ready for movies, especially not this one.
Besides which, all the characters were meant to be archetypes. Easily digestible characterchures of Anime and Western tropes so that we all know what they're about because we've seen them a hundred times before. We know all of them from the get-go because we were meant to. They're not supposed to be Shakespearean characters, alas and alack with angst and drama, they're condensed and concentrated heroes distilled from a thousand shows and stories from our childhood.
I mean for fucks sake, Mako is literally supposed to be Rey from Evangelion!
and the Jaegars! Tatic Ronin is an Eva and Coyote Tango is a Mobil Suit!
Not to mention the Kaiju! Seem familiar? King Kong. And a 3rd-tier fucking knife-headed Godzilla monsters!
And that's the whole point! It doesn't stand on it own because its not supposed to. Its a love-letter to Kaiju and Mecha fans, and if you're not one of those, then yeah, this movie isn't for you. At all. In any way.