I would have had more Robin in from the beginning. Of course self-described "purists" were just fine with no Robin at all. I wanted Robin to have his own spinoff series. Heck, if Timm/Dini team could have used Dick's Robin in a 90s era Teen Titans show, that would have been fun.
It would have been fun if at least one "non-canon" villain from the 1960s live action show were updated during the run of this series. King Tut, Egghead, somebody. (I guess Maxie Zeus was vaguely reminiscent of Tut's shtick, but...)