For me, the most important thing is that the affiliate program pays out money. Payments happen, sometimes there are delays, but usually they last 1-2 days, and they don't delay longer than that. On average, the funds arrive on the 6th or 7th day after the order. This isn't the fastest payout among all the affiliate programs I've worked with, but the main thing is that the money is withdrawn without any additional fees. Waiting a week is quite acceptable. Payments are made to a ruble WebMoney account. They don't require you to remove other ads from the site, but it's important that there is no adult content and the ads don't cover the player. My site is about movies, with about 30k visitors a day. Income varies: sometimes it's 2k, sometimes 5k, depending on the situation. Overall, things are going well, traffic isn't dropping, and you can set up pop-ups. Their ads are standard, the same kind you can see on television. The length of the video can vary, but generally, they pay for 3 seconds of viewing.
