A few issues people have raised.
A character limit on comments. Was set arbitrarily low. Now that's fixed/changed.
Nested replies were limited to two levels. We've increased it to four.
The block are obscene language seems a little tight to some. We're investigating. We don't want to block everything but are not sure how much profanity add to the commenting ecosystem. Welcome your feedback.
Lack of ability to use mark-up in comments. This should be working but isn't. We're investigating and will be moving a fix.
Hey, how do I get an avatar? If you're logged in, you should be able to go to your settings page and upload an avatar of your choice.