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Depends on waht you want to do. I use MorphOS privately as main system, but not exclusively (there is also Win, Linux and OS X).

Best current browser is OWB. That one does really a alot, but still things like flash or a video plug in are missing. Java applets don't work (no JVM available), too (but fortunately I haven't seen Java applets since ages out there).
Word processing is generally rather poor, however there is a nice DTP package (pagestream) and you may use google docs with OWB.
Mailing depends, if you use POP3 then you don't have much of a problem and may chose either simplemail or YAM (they are both good and I use them as my main mailers). SimpleMail does support IMAP too, but a bit limited.
I use MorphOS as media center in my living room (music and vids), for mailing, surfing my usual sites, do some IRC, read pdfs and so. Also I use some gfx apps and occasionally I try to program this and that, use some audio apps, edit some html or play a game. That's all fine with MorphOS.
Office stuff I do with my other systems only and I think the mixture to have several systems around is quite relaxing. I use whatever and whenever suits my needs best. Often this is MorphOS, but I have my other systems for a reason.