I played the four campaigns one time and now I'm replaying the Destiny 2 core one for the second time.
I already had this feel the first time, but now I'm sure about this: the main quest line is solid with some moments truely memorable, but it's too easy. A lot of moment in the Halo games are unforgettable becouse at legendary aren't epic just the plot, but also the gameplay. Destiny series has a great gameplay and we can truely see it in hard activites.
I think it will be amazing play Nightfall Campaigns. And I'm not saying just a quest every week...I want to replay all the campaign straight for immersion. I don't care about reward...we don't need a reward in this game mode.
Think about this Bungie. Becouse right now you have a good story in the game ( amazing in the lore ), but enemies of light just keep shooting to birds and speaking about weather forecast while we kill them.
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If you were around during SoH, you can always play with the green armor to put the enemies at red skull difficulty level.