Here in Brazil this Expansion is so expansive xD
What I'm gonna lose without this?

New class, new campaign, jungle zone and probably runes (not sure).

If game price is problem for you I highly recommend to check out the game first - will you like it or not. Because it is, well, debatable.

No, you miss out on runes and mercs.

not worth playing even with the dlc

Nope. No runes no game at this point.

It was ok up till last season. I used to make an alt for running pits to level my main.

Than a big chunk was hidden behind expansion.

Just felt lacking knowing how much faster it would go if had access to it.

Specifically boss power that a lot of builds used(Harbringers)