I haven't looked at the site in detail yet but big question is how much Merit the block explorer in question has, if the person who suggested it doesn't come back and submit his personal rating score.
Maybe we can also shoot Bitcoin_Arena a PM if the submission is still valid?
It has some features that AFAICR doesn't exist in most of the other explorers in the list
[it might be more useful for those who like to analyze stuff]... It's not perfect by any means, but I think it deserves a spot on the list. Initially, I thought this might put some pressure on Bitcoin_Arena to respond, but I guess it's better to ask than to wait for a few more months
[I'll do it shortly].