Bitbet.us is about as legit as parimutuel betting sites get. While some things the proprietor says on their blog are controversial, Mircea is probably one of the most informed actors in BTC finance.
I could see S.DICE (the security) going on the warning list though after Erik pulled the stunt earlier this month (later rescinded) where he would withhold dividends to pay back the betting pool which had mysteriously turned into a "personal loan" from him to S.Dice. That and the other lax record keeping that may mysteriously arise to bite investors would seem the S.Dice security is at high risk of operator (i.e. Erik) dysfunction. Then there is their mysterious "new improved site" that never appears and questionable payroll expenses.
Mircea is a proven liar and an elitist idiot, just read his blog, quite fascinating to feel inside of the mind of a douchebag for 5 minutes and Erik well, he's Erik, you can tell about him by the people he is associated with.
I think MPOE-PR is Mircea himself, but that's just all my opinion, no solid proof (aside from the fact that Mircea is a liar).
In addition to the controversial/offensive content he has a lot of useful gems like this piece on hedging as a miner. If anything I think the offensive stuff serves as a filter to weed out readers who aren't serious enough about business to consider the useful information he provides.
I'm also rather certain MPOE-PR is a distinct human being who works for Mircea. He seems busy enough with all the time he spends on IRC, with his other ventures, and with the girls that I think being his own forum PR would require him to possess some sort of time machine. Some sort of device like the one in that confusing film Primer might work.
I agree. There might be some offensive content, but at the end of the day there is a ton of very useful articles, like the one linked above.