The hate for Tiny Tina is silly because you deal with her in the main game for all of 1 mission and 1 optional mission. Despite how much Gearbox pushed her in the marketing (and later the DLC), she's really kinda there and gone.
I'm surprised that there isn't more hate for Moxxi since Gearbox pushes her onto you way more often and devote an odd amount of time trying to flesh out her backstory and characterization. Meanwhile characters from the first game (Dr. Zed, Marcus, etc) just kinda exist without any pay off or focus.