- Has many security flaws
- Does not show web pages correctly
- Lacks common features other browsers use
- Can be made to run/install a program without you knowing
- Can be caused to perform actions you didn't tell it to
Washington Post --- "Internet Explorer Unsafe for 284 Days in 2006"
C|NET --- "Internet Explorer 7 vs. Firefox 2"
Security Focus --- "Time to Dump Internet Explorer" (2004)
Here is a site called BrowseHappy which also talks about Internet Explorer being unsafe and other browser options