Points 2) and 3) seem limited in scope. For 3) that was only 1 competition that I can think of, but I agree that was a terrible competition format and executed poorly. For point 2), you can just ignore the exploratory notebooks if you so choose. I agree with point 1), the website is steadily getting slower and worse, and was already a pretty slow website. I am not a web developer so I don't really know why it is so slow, but it is really noticeable. I agree wholeheartedly with point 4), if you want to make money directly from the competitions Kaggle is not a wise investment. However if you want to transition to data science Kaggle is a great resource for learning.