Experience does not equate to cynicism, or at least shouldn't in a 'good' developer. And experience is indeed a common 'replacement' for youthful enthusiasm, mo

Experience does not equate to cynicism, or at least shouldn't in a 'good' developer. And experience is indeed a common 'replacement' for youthful enthusiasm, mostly because greater experience (usually) brings with it lower risk, faster / cheaper development and a greater chance of success of the project. If you are a junior, no matter your level of enthusiasm, you often don't know what you don't know. Personally I'm happy to work with people of all 'types' as it's possible to take the best from them and ignore the worst (unless it's destructive to team spirit and the success of the project). Many occupations have their cynics and difficult or annoying personalities, software development is no different.