Frankly, if there were no way to import HTML pages into WordPress, I wouldn't give it the time of day.
However, I find it disturbing there is only one plugin, and apparently a problematic one at that, for accomplishing this.
Does it preserve original formatting, or do you have to go back in and tweak every page individually? What about images? complex tables? CSS? Does all that get passed into the WP system?
Or, what is the "state of the plugin" for this plugin?