Blaze has tons of great lessons and two really awful ones
My daughter is obsessed with Blaze, and it's genuinely entertaining. I bought all the episodes on Amazon glad for an educational alternative to her fascination with dinotrux, which I hated (way too much pushing and hitting, no positive females). Blaze has a great female role model in Gabby, and my daughter pretends to fix all her cars every single day alongside her Sophia the first doll, which she calls "Gabby." Don't worry about the science terms, for anyone who would take the time to google centripetal force, inertia, and friction are actual physics concepts that are accurately described in the show with catchy songs I would purchase for car trips if made available.
My kid uses the science vocabulary regularly but with typical toddler lack of sophistication also regularly employs Crusher's catch phrases, like the supremely bratty "me me me!!!!" when she's frustrated, which is so ugly (and embarrassing in public). She knows Crusher is the bad guy, but there have been multiple studies that show kids imitate whatever social behavior they are simply exposed most on TV to rather than what the plot writers say was the correct behavior in the message tacked on at the end of the episode.
My other issue is with depictions of effort. "Let's blaze" is a magic phrase that makes winning easy by activating an intrinsic (not worked-for) power in the main character. Blaze wins (easily) every single time, even when he has put in less practice than everyone else in the competition. I try to redirect the message to be more realistic and helpful by chanting "let's blaze" when we are attempting something difficult (e.g., putting on shoes by herself) and telling my toddler it means "let's work our hardest."
If I could also get her to stop repeating the bratty Crusher phrases in every single episode, or if Crusher were even a little less obnoxious to copy, this would be a five star children's show for positive influence, educational value and entertainment.