Two things come up for me:
1. I'm curious, how do you imagine people will discover there are comments on a specific URL? Will it show up in their browser? An embed that sites can use to show it on their site? Other?
2. I found that the name made me feel a little confused and hesitant to engage, because I didn't want to roast the article I submitted. I get the feeling you started in one direction and may be opening up, but I'm not sure.
2, Admittedly the name is somewhat provoking. My point is to encourage different opinions. You have to find some value it the stuff that you roast or you will not spend your time commenting, right?
2, I personally see roast as one type of emotional attack or speech act (still looking for a better term for it), along with praise, question, supplement, etc. I don't roast things much but I do the others so personally I may feel a bit repelled by the name. However others may feel attracted by it, there are lots of us internet folk :-) good luck!
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Warning: I have very few users. So you will still feel isolated, unless you can gather a community yourself.