diablo 2 was more about item hunting, it was about pvping..about lvling, and about making alts .. and the secret cow lvl... you could skip act1s first quest and instead just kill andy if u wanted to.. u still had to gather all the pieces of the staff. but the good news is.. hey you can go straight to duriel after.. same with mephisto and diablo.. and baal really.. instead of being force fed a bunch of bullshit quests that we need to complete 3x..just to progress.. theres the option to skip shit.
my problem was never about replayablity.. its about the lack of reward.. item drop rates were insanely low, all the good rares.. were really not that good.. and legendaries.. could be awesome or terrible depending on whether they came with 1 wrong affix.. or stats way too low. did you ever hear about that strength bow in diablo 2? of course not... the bow was predetermined to have dex on it.. because things were right back then. blizz screwed up with the AH and making customers rely on it in order for any trade to even be remotely viable.. and the game suffered because of that.
as for the trailer.. ya it really doesnt do much for me at all. i might get the game just to explore it. but after being handed the pile of shit that d3 turned out to be. im not gonna get my hopes up into thinking the expansion will be any better. atleast they are trying to fix legendaries though.