What Mythic is adding in this patch doesn't even come close to justifying the word "expansion". I played the game in beta and at release and enjoyed it for a while.
However LOTRO has been adding huge content with their "chapter" updates and never called them an expansion. When they actually came out with a a real expansion it was pretty massive in content (Moria, new classes, etc).
The "free expansion" term is what people are having issues with and it's justified given that this is stuff that should have been in at release.
I do think it's cool that Slayers are in and Hammerers are out. I might actually come back long enough to play around with one.