IMO, Microsoft has no downfalls. They work fine for me. Everything works fine for me. I could care less that you have to download virus programs, spyware programs, etc. It doesnt take up more than 20mb on your computer and thats not even much. I enjoy the time Microsoft brought to the digital era. If it wasnt for them, you wouldnt be using linux, mac (the later versions), firefox, opera, etc.
And remember that you'll never get me to change my mind