I gave $5 to pre-order Diablo 3 on Gamestop when the hype train was on full speed, but after I saw the actual game, (not the reviews mind you which were all good except the user reviews) I was unsure until my buddy bought it and he told me clearly not to buy it, since he casually played through it in 3 days.
I just finished Torchlight 2 the other day and the game was pretty damn awesome, I'm glad I bought that game instead.