I noticed 2 issues with the subscriptions to forums and topics.
One the email does not contain the content of the post.
Second when you subscribe to a forum you only get new topics not new replies I would like to get both.

One the email does not contain the content of the post.

My Controls (UCP) -> Email Settings -> Include a copy of the post when emailing me from a subscribed topic
Set this option to yes :o

Second when you subscribe to a forum you only get new topics not new replies I would like to get both.

Forum subscription is meant to be used to get notified of new topic started, that is more a suggestion/request than an issue :o

[quote name='tera

Use topic subscriptions for replies.

I do but every time a new topic is made I have to make sure I subscribe to it.