As my friend TB and many more are saying Star Power was shown on Opening day and it's only wom taking over later I'm going to post my answers which are very well put by Journalist Himesh Mankad, so I decided to quote him
What has a superstar like @iHrithik added to #Super30? Well, because of his presence and reach among the pan-India audience, the word of mouth has spread like wild-fire, resulting in superlative jump on Saturday and Sunday.
There is a loyal @iHrithik fan-base, who was waiting to see him a good film for a while, and once the reports of #Super30 came out, they are going out in numbers to see their hero on the screen after so long. Hopefully, the film will sustain on Monday and put up a strong total.
I feel he gave a great answer, it's not sensible enough to not give the credit of sucess to a Superstar just because his movie was wom dependent, it's his reach which expanded it's business potential.
Here I'm completely ignoring the effects of Flop music, Controversies, Extremely mixed response to the trailer, No Promotions on opening
It's not a good opening but not bad also considering the above factors and HR's current low phase.