Volume.
say 1% is the percentage of people experiencing issues...
so nokia sells 300k of whatever their latest phone is.. i don't know what that would be.. I stopped paying attention to Nokia phones in 2001, but we'll call it the N97.
In the same amount of time Apple sells 4 million iphones.
So you have 3k total people experiencing issues with nokia phones
40k people experiencing issues with apple phones...
of that 1% you have probably 20% who are unhappy to the point that they get irate about it, post youtube videos, flood forums with comments about how they would have designed the iPhone4/N97, etc..
*obvious tag*