Doesn't look bad, importantly did you make it in a vector program?
A lot of what goes into banners depends where they are placed. That would be fine for a header, but too much open space for a random banner. What you could do is add some water effects to the background.
I think it looks great. Very clean and simple is best. If you plan on using it in any media aspect other than just website banner I would agree with Absolution about creating it in a vector program if it hasn't been already.
* Yes, pro should be spelled out and maybe have that first section as a title such as:
Starcraft Professional Gaming
News . Community . Team
or
Starcraft Professional Gaming: News . Community . Team