Perhaps if Watchmen was actually good it would of made money?
I don't really understand the mentality at WB, they made a cheesy niche film running 2 hours and 40 minutes and expected it to do well? When last year they released a fast-paced, entertaining hour and a half movie that made tons of money. It does not take a rocket scientist to figure out why.
For the most part though most superhero properties should be pg-13 because its for kids. Now let me explain, kids aren't stupid so that doesn't mean they should be dumbed down like Fantastic Four, etc as I'm sure many kids enjoyed Dark Knight, but in the end ultimately it is for kids so this isn't a particularly big deal.
There are of course a few properties that should be R like Terminator, Bad Boys, if they ever make Preacher, etc but I doubt those will be effected because they only get made every couple of years to begin with.

For the most part though most superhero properties should be pg-13 because its for kids. Now let me explain, kids aren't stupid so that doesn't mean they should be dumbed down like Fantastic Four, etc as I'm sure many kids enjoyed Dark Knight, but in the end ultimately it is for kids so this isn't a particularly big deal.
There are of course a few properties that should be R like Terminator, Bad Boys, if they ever make Preacher, etc but I doubt those will be effected because they only get made every couple of years to begin with.