One of the fantastic benefits (mostly for me, but also for readers) is incorporating captcha. This immediately eliminated spam comments, which had been requiring a whole lot of effort to keep under control.
The change also introduced some problems with getting comments posted. I've checked on how things are working now, and read the support forums to check on the status of the problems. Things seem like they have settled down somewhat, but not all problems have been fully resolved.
Hopefully these problems will be taken care of sooner rather than later. In the meantime, please accept my apologies for the commenting problems.