I used to exclusively wear Snell approved helmets but I went modular a few years ago. Yes I know that it IS possible that in a specific situation the chinbar can come open and cause injury. However it is also possible to land in such a way with ANY helmet that you snap your neck, etc etc... riding a motorcycle carries Risk, we have all accepted that risk. For me the increased risk of a Modular is acceptable. I had a Scorpion Transformer and liked it, but went with a Shoei since it was rated higher IIRC (and it's lighter)
As to the standards, actually the DOT standard is not as bad as you think it is, it's no ECE standard that is true, but it's not worthless IMHO (The "Brain Buckets" don't count, I really believe that the only test they pass is that the sticker the makers and riders buy can adhere to them, heck I remember being up at Marcus Dairy and watching a helmet Vendor peel and stick DOT stickers on these tiny brain buckets) as for Snell, it is good to have an independent reviewer, but I've read a lot of reviews that claim that snell helmets are TOO rigid, that in an accident yes they hold up better, but they transmit MORE force to your head instead of yielding and absorbing the impact. I just don't trust Snell anymore...
Just my 0.02