Lurpoa, on 2011-July-14, 23:46, said:
Because this hand is not worth a 1m - 1x - 3m response. It is only 15 and while the suit is good the points are soft. 1m - 1x - 3m takes up a lot of room so should be quite good, nearly forcing, at least around the strength of a reverse. 1m - 1x - 2m can be more wide ranging because partner can pass with a weak hand and invite (and use the extra room to resolve the invites) with a moderate hand.
I'd definitely open this 1nt. I tend to like opening 1nt whenever I can. Good things happen, our bidding is well understood, declaring 1nt is nearly always good, 1nt preempts the auction, etc. Similar to what Phil says, I probably open 1nt way too often. It used to be I'd never ever open 1nt unless 4333, 4432, or 5m332. Now 95+% of the time I'll open 5M332, 5m422, 6m322 hands 1nt. I'm sure over time it will be like a pendulum and I'll eventually get better judgement on when not to open 1nt.