I am not sure where you've heard the bad things about PeerFly, but any company is going to have it's naysayers. PeerFly is a legit company with a great background and we continue to stride to provide the best opportunities possible for both our publishers and advertisers. You can find more information at:
PeerFly is NOT a Scam
Also, we have hundreds of reviews and payment proofs on our Affiliate Paying page:
PeerFly - CPA Network Reviews - Affpaying
Please let me know if you have any questions.