What is most important quality in an actor for you as viewer?

Looks or acting talent?

What is your criteria, most important factor for you in developing liking for an actor or rewatching them again?

I think both play an equally important part. Acting will get you nowhere if you don't have the pnscreen charm, you will end up getting roles like Rajpal Yadav and Paresh Rawal.

Both in case I’m into them but varies as both are subjective. I also look into their personality etc. 

Both. Can’t choose one. Even if you somewhat lack in acting, you gotta have some screen presence or spark. What’s the use of even being pretty or an eye candy when they are so bland onscreen. They gotta be somewhat talented as well. 

For me an actor should have a great screen presence and charisma. Great looks or great acting only isn't sufficient. Otherwise the likes of Aditya Roy Chopra or Rajkumar Rao would have been superstars. BigB is prime example. His aura onscreen is unmatched. 

I am not trying to be less superficial or anything,I am a very superficial person.But when it comes to actors I have grown to care only about acting.There are beautiful women in BW and few good-looking men too,and I appreciate those photoshoots and when they dress up and stuff.But when it comes to their presence in movies,it's acting for me.For me,a gorgeous looking but decent actress with good performances is lesser than a cute,pretty looking actress with brilliant performances.

No matter how much ppl say they prefer Acting, but sad hard hitting reality of Cinema is that none of that brilliant actor attracts that kind of Stardom which a Good looking Actor does with even average acting.

I like Hrithik Roshan, Amitabh Bachchan, Amir Khan, Aditya Roy Kapoor and Ranveer Singh's acting. So, I selected acting.