Project Euler is good fun and great for improving your algorithm design and understanding of basic programming constructs, but I think its a poor way to improve

Project Euler is good fun and great for improving your algorithm design and understanding of basic programming constructs, but I think its a poor way to improve software engineering skills in general. Being able to write clever efficient algorithms is good but not nearly as critical as grasping important design patterns, OOP, methodologies like TDD, frameworks and databases you're using, etc.