Not the best of the photo competition sites, but not the worst either. Nice that it has competitions with prizes, but far too many clickbait emails and persistent notifications trying to get you to upgrade ($) to see your stats, enter off-limits competitions and gain other pointless social media-type benefits (ie, ones where you do the work and pay for the privilege). It has a ridiculous 'curator' system that encourages you to send pre-formed messages to complete strangers in order to get them to be more active. The UI is a bit bonkers, and makes it hard or impossible to see precisely how well you are doing or have done in challenges, how many votes you got, etc. Makes one wonder if there is deliberate obfuscation going on for some hidden purpose. Maybe the levels of user activity aren't as great as they like to imply.
Having been on this and other photo contest sites for several years, I think the biggest problem is that its peer image voting system (showing four photos of different sizes on a screen you have to scroll FCOL) simply doesn't work. Far too often the peer voted 'winner' in a challenge just isn't that good. This isn't sour grapes - it is an objective opinion that the site throws up poor images as winners far more often than other sites. This, again, suggests that the volume of voting isn't high enough for the magic 'algorithm' to work.