Syempre, there are two sides in a coin.. Pero walang connection yan sa sagot.. :D
Because you're Filipino, (as I am), I assume that you've been using MSOffice all your life. Ako rin naman. Pero try to consider that more often than not, we develop our own biases..
For an average computer user, the difference between OpenOffice and MSOffice is too minimal to notice (except maybe for the difference in the interface). For basic works, most people will feel comfortable in using both..
I don't believe that MSOffice is better for the corporate environment and that OpenOffice is just for personal workflow. First, both of these products are stable, so using them in any environment will be okay. Those who say that OpenOffice is too unstable are those who haven't tried it for themselves.
The problem of formats is one that is being resolved. I don't think that formats now present a barrier between these two applications.
Maybe, the thing that prompts many people to avoid OpenOffice is the fact that some of the MSOffice components are not part of the OpenOffice package. There is no Access counterpart, for instance. But since most of the userbase of OpenOffice use other free open-source software anyway, it's not really a big problem.
Pero in defense naman of Microsoft, the MS Office suite is still the biggest selling software suite, for both Mac and Windows..