It's really a shame that so many people (yeah, mostly Windows users) are so focussed on MSN as their primary IM and thus force so many others to use it as well...!
While this app is generally better (albeit uglier) and has more features than the original client from M$ it still has lots of problems...! First of all for some reason it takes like forever to launch...!? Then it places that stupid downloads folder on my Desktop, even though I have changed that setting in the prefs countless times...aaargh...!
The (German) localization has several errors, the GUI gets messed up occasionally, video -- although it generally works -- seems to bring down the app occasionally and the whole thing has crashed on me numerous times...
Unfortunately the ones of us who happen to have friends, colleagues and family who don't know better will have to put up with all this, since there are real alternatives around...and as long as there are several major IM systems out there, there will always be need for a good multimessenger that covers it all...! But that will probably always stay wishful thinking...
(Don't start with Adium or the resurrected Proteus now, or the few options that iChat has in that area -- non of that really covers it as good as is necessary...)