[sblock=ooc]As a DM, I used to subscribe to the "roll behind the screen" philosophy for combat. I did it because I thought it made the game more interesting and more scary/unpredictable/dangerous. But that was back when no one talked about OOC/IC and players were allowed to sit there with their own copy of the MM's.
But PbP is very different as a player, imho. Plus, I'm not familiar with all the monster stats in the current version of D&D, so I don't intuitively know what monsters need THAC0. Now, not getting to see the combat rolls for the attacks that hit makes the game seem less real (currently playing 7 other PbP's and this is the only one where no rolls for combat are rolled on the forum), like I'm reading a story and not playing D&D. Seeing the rolls that hit allows me to get sense for how skilled or dangerous they are and brings the game to life for me. The monsters feel more interactive and less two-dimensional.
Even if we only saw the rolls that hit, I think it would be sufficient. Since you're rolling on another forum, I wouldn't need to see misses, or any opposing skill checks. Same with initiative, it's only rolled once by any opposing monster and largely irrelevant after the 1st round so I get nothing from seeing it. Certainly not a deal breaker, but it would make the game more enjoyable, from this end, imho. [/sblock]