Check_MK has done a really amazing job at making the information you need easily accessible and with good readability. As we have used many monitoring systems over the years, both before check_mk and after, we always value the ability to access information and understand what we are seeing. Many monitoring system that focus on the visualization of data seem to over do it and while it may be fancy it is still complicated. In the reverse of that several just don't have good simplistic visualization of date and that makes it hard to narrow down and find out what is going on.