[blowski]

There's a bit of selection bias. Developers are more willing to stay working on good systems for much longer, so there are fewer job openings for other developers to work on them. Hence, most job openings are to work on crappy systems.

[whstl]

You are 100% correct, but my observation was more about how I actually got to work on good projects and enjoyed, but I just don't remember much about them because they barely needed my intervention.

Naturally I'm not counting the stuff I built myself: I definitely worked a lot of time on them and they were a breeze to maintain, but I won't classify them as good bad, since the one thing I'm sure of is that I'm biased about their quality ;)