They do provide ranking and so you know how your model performing in general.

The best thing about Kaggle is that before diving directly into the competitions and other stuffs, one could first learn from the Courses and Certifications provided by Kaggle. It gives extensive education to the learner about how the things actually work. Other than this, it gives remote access to hardware and softwares that one could only dream of. The community, is far better and accurate than that of Stack Overflow as only relevant questions are addressed. It is a complete package from Beginner to Advance track in Machine Learning and Data Science.

variety of competitions for the users are perfect