Who overacts more on-screen? Varun or Ranveer?

but varun is not ott off the screen

Omg I haven't watched this movie, but this scene. Horrendous is the word. Is he like this throughout the movie?

Well...I will let you draw your own conclusions 😉

https://www.rediff.com/movies/report/review-befikre-is-a-maddening-waste-of-time/20161209.htm

Masand - Ranveer Singh does everything he can to elevate the material with his unputdownable energy, at times running the risk of overdoing it.

https://www.rajeevmasand.com/reviews/our-films/kiss-sell/

Baradwaj Rangan - But I didn't buy a minute of it. I didn't believe Dharam and Shyra would move in together. I didn't believe they'd continue being friends after breaking up. I didn't even buy Dharam and Shyra. Ranveer Singh tries everything. He does a killer imitation of Anil Kapoor's dance moves from Ram Lakhan. He struts around in his briefs. He bares his butt. (This is one film where the hero is asked to take off more clothes than the heroine.) Vaani Kapoor speaks more than passable French, and she dances magnificently (though she seems more a dancer who wows you with technique rather than transports you with emotion). But the two together strike no sparks. They are as much caricatures as the film's gay and lesbian characters.

https://baradwajrangan.wordpress.com/2016/12/09/befikre-an-underwhelming-rom-com-with-some-interesting-ideas/

Not really. SRK's whole career is built on this Irony. 😆