Depends on the title, but none are "good."
The site has become infamous for leaking new movies within hours of release. But the big question floating around online forums is: “Is the Tamil dubbed movie quality on Isaimini actually better than official apps?” isaimini com tamil dubbed movie better
Before going further, here is the unfiltered truth about Isaimini. While it claims to offer "better" quality downloads for free, the reality is bleak: Depends on the title, but none are "good