What drives some people nuts about 37signals is that their products are not for everyone. But they’ll be the first ones to agree with that. Rather than trying to build things that work OK for everyone, they’re building things that work really well for some people. And how often does building something “for everyone” actually work out, anyway? The closest anyone has ever come, I think, is Google’s web search. Good luck trying to duplicate that sort of success.
Copying the Wrong Thing. Being apart of web 2.blah blah you see copying quite a bit. But what you hear is, “Our app is just like that one, only better with more features”. That clearly isn’t the way to go.
Source: daringfireball.net