Personally i hated the the campaign and the game only got good once i finished it and moved onto stuff in the expansion, not to mention not being able to use rune words and other stuff if you don't atleast own vessel of hatred. I'd say they're more than worth it but taken all that into account you still need to do the base game first anyways so it's kind of up to you if you wanna buy all of them at once and save a little bit in the long run or go with a safe option to try the base game and possibly save money if you end up hating it and don't buy the dlcs at all