I think this is very true. Senran Kagura Burst is probably one of my favorite games in a long time because the gameplay is very fun and rewarding. I never would have imagined investing as much time into it as I have.
If you have both systems, I'd recommend starting with Burst. The stories and character backgrounds in these games are actually engaging and that is the first chronologically. Timeline wise, they go: Burst, SK2, Shinovi Versus, Estival Versus.
I don't remember if it's ever been asked before or not, but in the event that Marvelous Europe (or even Xseed) get to interview Takaki with fan questions again, I hope someone will ask him on his thoughts about Senran Kagura and the PC platform.
If you care very, very deeply about story and don't care about gameplay or humor at all, start with Burst. Otherwise, Versus is so much better in every way it's not even funny (and has recaps to get you up to speed on the story anyway).
Versus is a side story, performs far better, has better controls, more focus on humor and backstory over "main story" (but it ends with some real story), more focus on "boss fights" (main character vs main character) than hordes of trash mobs. I platinumed Versus and I could only stand about 2 chapters of Burst.
I have SV and Bon Appetit and love them both. I'm hyped for EV on PS4 and the ways that Takaki-san will take advantage of the increased power.
Obligatory Hometown vote and Katsuragi, Hikage, and Ryona are my favourites.