I have not written an article for a long time, I got inspired lately for something that I roughtly talked about some time ago. It lists 4 important rules that should be followed for board game design. Here is the link:
http://bgd.lariennalibrary.com/index.php?n=DesignArticle.Article-ruleOf4s
Enjoy!
Yes I understand your point of view that shorter games are more likely to be filler unless they are close to the 60 min.
It's not that I consider those games to be superior, I would love to design and play such games, it's just that if you want people to play your game, you have to go for short commitement games.
Most of the time, your prototype is competing against dozen and dozens of other commercial game which always looks more cool and interesting than your prototype. So convincing players to play your 3 hour game they never heard about is risky, on the other hand playing 3 hours on a game they read a lot of comments, they are willing to take the risk. If your game is 30 minutes, they are more likely to take the risk to play your game even if they have no clue what your game is.
So unless you have a dedicated group de playtesters, the only way to make your prototype get attention from all those commercial games out there is to try to convince people to play it as a filler.
It's unfortunate, but if you want your game tested with real people, it's the sad truth, especially today with generalized short attention span.