These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Harsher in Hindsight - Annalise was presented as an antagonist in most of the first season, even though she softened a bit in the second one. But try watching her fail knowing that her voice actress, Michal Friedman, died while giving birth to twins she had with her then-husband.... Dan Green! Man.
MST3K Mantra - An essential part of getting any enjoyment from this show, if you're older than eight.
Special Effects Failure: The CGI and Flash animation would be impressive...in the late 1980's. Now, in the 2000s/2010s? Not so much...especially considering the leaps and bounds Adobe Flash animation alone has gone through (sometimes the best being barely able to distinguish between traditional 2D Animation). The CGI cars...even in Beast Wars they'd have been a laughing stock in the CGI animation community.
They Wasted a Perfectly Good Plot - Speed Sr. only makes himself known to his son at the last second of Season One, leaving viewers without an answer to why he went into hiding, what adventures he went through for 40 years, where the other original characters are, and what he's going to do now! Instead, we get episodes that recycle the same exact plot with the same villain in a school setting. Speed doesn't even get to race outside of the campus! Season Two doesn't seem to make things any easier to understand, as Speed Sr. leaves again at the end of the first episode, and only make sporadic appearances after that!