That last part was what bugged me the most throughout the campaign. I can't tell you how many times I went through environments - not just levels, but environments - and immediately had callbacks to specific areas from Destiny 1. Remember the Sparrow section of the Cerberus Vae III Strike (Valus Ta'aurac (sp?) was the boss, but the tank was the most memorable part) where you go through that valley of Vex and then through that winding valley? Pretty sure I walked through that same area on Nessus. Or was it Io? Both planets have very similar features to the design of Venus and layouts quite remincisent of a combination of Mars and Venus. It gave me this weird feeling of having already been there before rather than visiting these amazing new worlds.
Glad I'm not the only one who thought on multiple occasions "Hmm, I'm having mild deja vu here". Like, it happened often enough to where I'm pretty sure they did just re-purpose chunks of levels from Destiny 1.
Destiny 1 is prob the game I have sunk the most hours into ever, and I'm a tiny bit disappointed with D2. All the gameplay changes feel like a major update, but not on the level of a proper numbered sequel. I'm happy that it's more Destiny, but I feel like it's just that...more Destiny, and not a sequel. Having said that, I'll prob lose months of my life to this game again, but fool me twice, shame on me. If they skimp on major changes when D3 comes rolling out, I'll prob call it a day.