Yeah, I have over 400 games including the games with gold in my library, only really play two, Warframe and Destiny 2, haha.
I agree, for £8 - i think it is worth a go. I would've bought it myself, but I cannot justify adding it to the collection of shame I am yet to play!
The Forsaken DLC update sounds promising if Bungie can deliver... Thing is Base game, Curse Of Osiris and Warmind also sounded promising, so we'll see. But about this deal... For 8 quid it's worth it, the campaign is fun, just don't expect much from the end game. So heat for this price. Please note, as of now you can play all the DLC PvP maps even if you don't have the DLC. I am unsure if after release of The Forsaken (Destiny 2 year 2) if you will get locked out of certain activities of you only have the base game.