It looks like Betfury has already integrated several top slots providers on their site in the second quarter of this year. At least this item is marked as completed in their roadmap. I don't know for sure, but maybe they are planning to integrate a few more providers during the following months.
The only top providers currently available on Betfury are Yggdrasil, Thunderkick and Pragmatic. These were added added Q2 this year, so it has improved but as the other have mentioned no games yet available from Betsoft, Red Tiger gaming, Nolimit, Playngo, ... So for the moment there are better sites if you are a slot lover.
We all wait for those providers... I would add Relax and NetEnt on that waiting list as well! Probably the best providers at the moment, with so many good slot games! I hope that Betfury is working on that, it would be sad for us slot lovers if they don't add the most popular providers! So I guess Babygus is right, for people who like to play slots there are better places with more providers!