I don't think so
It adds like 6 new characters, which are kind of very nice
and it adds, i think 2 or 3 mechanics, including harder gamemode.
for me and my table i think it was worth gettin it, mainly because we played like every Weekend.
My Opinion: Totally get it if you like/love the Core.
I second this, very worthwhile if you like the game.
The new loot cards and the new characters add a lot of new strategies.
You also get extra components to play the epic mode, which last a turn longer.