very few things in life are just good or just bad...
competition is mostly good for us, because it encourages innovation, new products, lower prices etc.
(it can also be seen as a bringer of some bad things, such as lack of standardization or too many incompatible standards, half-baked products brought to the market to come before competitione etc)
I think the benefits of competition outweigh the drawbacks...
(although both Intel & AMD stocks have been going down... don't know why AMDs has been going down, but there you have it...)