That's a bit of an old topic, and has faded from my memory, but you are definitely in the right area.
I did a quick look myself, and it doesn't look like "number of views" is supported in that version of the API. Ratings is, you would use the:
For helpful/correct, I checked the ForumMessage and ForumThread entities and there are no variables for this data, so chances are it is not supported either.
As for tags, you should be able to get these from the ForumThread entity data + using the Tag Service:
Hope that helps. Unfortunately, given the age of Jive 4.5, it would be best to upgrade to at least Jive 7 or Cloud to take advantage of the V3 APIs (if that is a possibility)