Personally I find the mouse to work fine, but to each his own.
Well that sounds good.
Sometimes a game can get flight mouse control great or good enough, like in Freespace 2 or Battlefield 1942 respectively.
Other times they can miss it horribly. For example, GTA: San Andreas. In an overall great game, while overarching in places and doing an excellent job, the Console to PC flight controls just pooched it for me. The flight controls for airplanes really didn't work.
I eventually got good at flying with reconfigured keys but it was a frustrating experience.
Ignoring the flight experience in San Andreas, you have to admit that despite their valient and extremely customizable control page options, some of the translation from console to PC design really creeped through and made some general interface issues kind of awkward from a PC point of view.
I think I'll tackle an older patched up version of X before diving into this new morass of activated/invade your home and household type of DRM stuff.