Super cool. It was obvious what was going to happen but it freaked me out anyways.

Pantheon is an amazing challenge for people who already like raiding. Unfortunately for the casual player, its going to be fairly impossible to do 8 encounters in a row while 20 under level.
Onslaught is extremely boring unless you like shooting ads and killing mini bosses for an entire hour, but the rewards are fun. They "forgot" to balance them so they're all op.
The new crucible maps are great but the state of the crucible isn't, still props i guess.

A fun 2 hours for sure, exploring all the secrets and endings was cool. I wish it was a bit longer

Exactly like the original and totally seamless co op. You need to import the files from the DLC if you want to play them.