The issues with Anthem 1, if they don't exist in Anthem 2 and are actually addressed with the first game down the road may gain them a following or return customers. To not buy a whole series based on how the first title launched is nonsensical and not really how most buy titles. It would be like not buying RE4 cause you disliked the gameplay in RE3 or not buying No Man Sky 2 cause you hated the first few months of No Man Sky 1 or not buying FFXVI (if it is to be an MMO) cause you didn't like the first run of FFXIV before Realm Reborn. What we know is most don't really buy games like this. You can see from COD3 to COD4 or GTAIV to GTAV etc that how a title used to be doesn't have much relevance if those issues are addressed with sequels. By that logic, very few should have bought Assassins Creed Origin after the whole Unity thing, yet Origins outsold Unity and Syndicate and Odyssey outsold Origins. If issues are addressed, it is feasible to see a return in sales or even sales go past the original titles.
" after what happened to the first one. I'm not sure I would buy it. " You buy based on assumption or based on what factually is being offered?
So I might not like a game, but if its sequel addresses the issues I didn't like, I'm more likely to buy it then if they just ignore the problem and don't correct the issues. Example, after RE5, I didn't buy RE6.....
Until they returned to the limited ammo, health, puzzles, weapons etc I didn't return. So I just don't buy games based on assumptions of what I think the next one would be like. By that logic I shouldn't buy Cyberpunk 2077 because of all the glitches and bugs at Witcher 3's launch. Seems a bit silly.