It depends on what you want to do. At one time, Apple had more than 98% of the market but they kept such a tight rein on their technology, that the makers of the 8086 and 8088 decided to license the technology rather than try to compete with Apple. Everybody started building computers. Money rolled in. The 8088 became the 286, then the 386sx, then the 386 then the 486 then the Pentium then duel core and now quad core and beyond. Apple dropped to about 2% of the market, but now I think they are about 4 or 5% of the market (I think).
With so few users, there just isn't that much software out there. So if you know EXACTLY what you want to do and the software exists, then the Apple is fine.
What Apple demonstrates is a company that never learned to compete, only to fill a niche.