I think one of the problems is that for any project that is moderately complex you really need (or at least would greatly benefit from it) to master the languag

I think one of the problems is that for any project that is moderately complex you really need (or at least would greatly benefit from it) to master the language + companion library Boost. I did two relatively big projects (years apart), with the last one using Qt (because I also needed to do a GUI), and despite it working and doing what was supposed to, I wasn't entirely happy with the quality of the code.