To be honest, I kind of like the tone of Techcrunch. The fact that many of the writers on Techcrunch have their own voice makes Techcrunch more fun to read than other tech blogs.
If you're looking to build a competing startup news blog, I think creating a unique voice for yourself is a good way to build your brand.
Another option would be to have two versions of each article. First, the "your own voice" article, and then the "journalistic style" article which gets to the point quickly, doesn't inject opinion into the news, etc...
Interesting idea. Perhaps even do it in a 'readability' style where the main article is in your own voice with injected opinions and the 'readability' version is just facts.
Maybe even allow the 'readability' version to be edited wiki style...
I don't have a problem with them having their own voice, I take issue with their utter lack of spell-check / proof reading.
There is no secondary editor previewing the content, and it makes them look like fools.
May as well be the individual writer's home blog - rather than the content of a site which was worthy of a multi-million dollar acquisition by media giant, AOL.