With a nice set of tits, and if she's into it and gets turned on by it, then it's fantastic. Even if she has incredible tits, if she's not into it or turned on by it, it'll be disappointing
Titty fuck is one of my favorite things but reading this thread is making me question why. My tits are plenty big enough and it feels good, I always thought that it feels good to me because I like my tits being handled roughly. Maybe it's a little bit degradation too, part of my body being used for a man's pleasure.
For me it's not the titty fuck itself, it's seeing the cum hit her hair and face. I time it just right so I'm on the "up stroke" and my cock is closest to her chin when it goes off.