Dude, take what I said about a certain blog post of mine earlier: don't delete it. If you start from the bottom, and can work your way up, people will see a progression of quality. If you want to continue making blog posts and reviews, keep doing it, and keep your old stuff up so people can see where you came from.
That's kind of what I've been trying to do with the quality of my posts lately, blog or non-blog: focus on cutting out stuff that isn't necessary to jot down, and condense what you want to say into what is necessary to communicate.
Now that deleting messages/accounts is a common option on most sites, people like to use that to cop out and hide from their past. It’s annoying. Live with what you posted, and use it to motivate you to improve. Then you can laugh at the bad stuff one day, and be proud of how far you’ve come.