Thats perfectly fine, after all we all have different criteria on what is interesting and what isnt. To you constant temper tantrums happening on very frequent basis and slapstick humor when Misty smacked people heads was most " interesting" characteristic about her and i respect that. Though personally i enjoyed in other sides of her just as much like girly side, passionate love for hobbies and dreams, hotheaded side, tendency to tease, sassy attitude(shouldnt be mixed with temper because being explosive and snarky arent same thing) of her when being grumpy and strongwilled taking charge of things on her own or fact that she was outspoken while also showing that she can be very caring and compassionate too being one of character qualities.
Which was explored more through end of Kanto, OI, Johto or afterwards. Still showing temper, but in kinda more balanced way resorting to arguing and arrogance rather than trying to hit you with log and what not, making her feel more colorful and dimensional in interacting imo gaining bigger substanc. Thats why i guess i liked her just as equal like it was case in first half of Kanto, because while explosive side was still present Misty showed to have much more to her personality bringing extra depth and realism to character.
As people in real life change and grow up, fictional characters should develop too to prevent stagnating turning in one trick pony. Just like May or Ash maturity added new dimension to characters changing for better, same can be said for Misty too at least to me with development making it feel that she is getting somewhere not being in any way worse because of it.
So to me Misty remained just as great in more grown up, experienced kinda way gaining new traits enriching on characterization while retaining things which defined her and made great in first place like flare, comedy, spunk and quirky, curious nature.