This is actually my sleeper hit of the season. A lot of people have no idea who Tatsunoko heroes are or just write this show off for being 3D, but I'm enjoying it the most out of anything I'm currently watching which admittedly isn't a huge number of shows this season, but still.
Yeah, Emi's an emo little shit who's constantly making bad decisions, but the animation is great for 3D, the heroes have good chemistry, and the villains are interesting.
I've seen some but not all of the original shows. You don't need to know a whole lot about them to understand Infini-T though. It tells you all the important bits about the characters anyway.