Wordpress.com only accepts positive comments

That's right. Wordpress.com only accepts positive comments. I posted two comments today, on a new wordpress.com theme announcement and none of them were approved. In both comments I wrote about what doesn't work in the new theme and what i don't like. You can see hundreds of comments on that post, and all of them say "wow, great" and things like that but no negative/constructive comment. Great going guys, you show-offs!