Don't know about others but I don't hate her, I just just don't find her to be a good actress as of now. She might and will improve. She is a good dancer no doubt about it but as Ishana she is so so.
I don't think it's the problem with the character Ishana, 4lions always had OTT characters, being a follower of most of their shows, I have never un-enjoyed (my own terminology, don't look for a dictionary please) an OTT character, but unfortunately here I am not able to enjoy Ishana's antics because the actress doesn't act it out well. She is all over the place.
No offense to Vrushika's fans, it's just what I feel. Each to their own.