I think most of the hate on TCW movie is that it was too kid-friendly, or maybe because at that point the character of Ahsoka Tano was just created. Remember, they had just created Ahsoka, who was considered annoying at that time. Similar to how Reva in Dinsey+'s Obi-Wan Kenobi was criticized (in some ways) due to being the "annoying new character"; okay, Kenobi may not be the best example, but still, it mostly checks out. Difference though, TCW movie led into the long-running television series, which was in production a year ahead of what was broadcast, and therefore Ahsoka was able to develop and grow as a character over that time.
But that's just me speculating.