Yes – Windows has most of the disadvantages of X11 without its advantages, such as being useable remotely over a TCP connection (or ssh tunnel) or being able to easily integrate multiple input sources (e.g., responding to both mouse/keyboard and a separate TCP socket). Although I’m sure there are less well-known windowing systems that are even worse than Windows. (It’s been many years since I’ve programmed Windows (or X11), but my recollection is that the Windows API and Motif API were about equally horrible; and X11 required very careful reading of the docs to avoid memory leaks because of inconsistencies in the API conventions).