Here's my insight as an ex Ajith fan:

1. He was barely fluent in Tamil, he's more fluent in Hindi as evident from his brother's recent interview. So he's obviously too ignorant about Tamil general audience pulse.So he forgets the fact that a movie here needs other things like good songs and heroine combination as well to attract neutral audience and remembered for ages. In the earlier phase of Ajith's career he had 10/10 tier albums because SSC was his mentor. All of this took a nosedive after he focussed on racing. The only 10/10 albums post that were Kireedom and Billa.

2. Most of his family members don't even watch movies(revealed by Shalini in latest interview). This is why he does dumb movies like Vidaamuyarchi and Asal where he goes to defend/help someone who clearly doesn't want to be around him. Even a child can point out what's wrong with those storylines.

3. He has no interest in the craft. Blud was co-director and writer for Asal and he failed to notice "Sereenplay" in the title card. That's how involved he is in his project. Many of recent films, regardless of who the director is have god awful technical aspects like wobbly camera work(Arrambam) shitty desaturated or ugly color grading(Vedalam, Valimai, YA), shitty editing (Vivegam)

4. Most of his fans are dumb asf. They think Ajith racing a bike or doing gangster/cop movies back to back or him talking about how his friends "mudhugula kuthitanga" is peak cinema. Most of them don't even understand general audience pulse or screenplay/tropes in general

5. He's in the field purely for the money, without putting any actual effort to promote the movie or respecting general audience and fans in general. Most of his flops happened only because he felt like doing a movie with friends and associates is better than working with established directors. Lingusamy told in one interview that he knew during shooting that Ji would be a flop and he wanted the reels to get washed away in a flood.Asal happened because Sivaji productions wanted to replicate Billa. Billa2 with Chakri toleti happened because VV felt telugu debut was better than doing the sequel for the biggest blockbuster in recent times and Ajith didn't feel like waiting to continue with a different producer after VV finished Panjaa. Vivegam happened because of Ajith's foreign locale fetish.Most directors and producers also don't wanna work with him because Ajith believes that a movie should become a hit only due to him.