If you see an answer that could be improved, edit it! If you simply have a better answer to offer; well, we all love to show off a bit on occasion. Post a better answer!
That goes to everybody on this system, of course.
A big part of this process is actively building the best possible canonical answers to these questions… collectively. More users are coming next week, but right now, you are part of that process. It's time to make this site a place where experts will want to hang out. So, go ahead and fix the answers you see as lacking or go ahead and add better ones.
The first answers received are not necessarily the best answers (or even correct answers); That's what the voting is for. If you like an answer, vote it up! If you don't find it particularly insightful, don't vote for it. If it is unhelpful or simply wrong, vote it down. That way the best answers will rise to the top.
Why we obsess over quality questions
At this earliest stage, we obsess over the quality of the questions because the questions that appear on your home page are going to tell potential experts a lot about your site. It is, essentially, your design.
But you're right. The quality of the answers is just as important. But they're coming.
Next week we are going to open the front doors to this site (public beta). When experts come across your site, you want them to see very interesting and challenging questions, not the basic questions found on every other forum on the Internet. You want them say "Wow, this is the site for me!" Remember, the pro sites WILL attract the enthusiasts, but not the other way around! That is why it is so important to get awesome questions in these opening days.
See the blog post: Asking the First Questions
And don't forget to vote on the best content. That's how you reward users for their contribution and make sure the best answers float to the top of the stack!