Badoo used to be pretty usable for free: it had lots of filters, and you could hunt for new members. That's all gone now.
And it's become a lot harder to message anyone attractive. Most of the time if you find someone cute or sexy there will either be no option to chat, or else you click on chat and it says their mail box is full but you can still pay to message them.
And they are constantly hounding you to use pay services like sending gifts and stickers, get your message read first, get your profile seen more, and it goes on and on ad nauseam.
You can't filter out smokers and single moms anymore, it's like Tinder now, no filters. As a result, most people don't even say anything about themselves in their profiles, no real need to now that they know they won't be filtered out.
I give Badoo two stars because they have built a pretty slick website (didn't try the phone app), but holy crap have they gotten GREEEEDY! They must be making a lot of money pimping these girls out. But if you want to try your luck for free I would say don't even bother with Badoo, it's an exercise in futility.