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I doubt it will be a flop, but most games over the last couple of years that have promised a lot and been really hyped up havnt been anywhere near as good as they were hyped up to be.
The thing about Blizzard games is not that they are revolutionary - they take existing game features and seamlessly combine them into something fun to play. That has always been Blizzard's key to success.
Take WoW for example - it wasn't anything new even when it was launched - it was just polished and fun. Same with diablo 2, warcraft 3, etc. I for one am very happy with the graphics design direction they chose - not because my machine won't handle it otherwise - simply because it allows them to focus more on making it a fun game to play, while it retains a timeless easy on the eye look.