The thing is, there are so many mods that it really does have all sorts of ways the experience can be modified.Wow. You are really up in that koolaid. Minecraft has very little potential beyond what has already been observed and you are fantasizing about a game which is not Minecraft. Likely a game not made by Notch.
Anyway, thebestgamers really stepped it up with this review. I got tired of them awhile back(aside from their awesome pop-ups), but this is a legitimate counter to the rather absurd acclaim(which is to say the highest kind of acclaim) the release is getting. I like the little jabs at YouTubers, indies using "retro graphics" poorly, and people excusing the game because of friends. It alludes to a rather big problem in my eyes: Minecraft(Notch) is critically acclaimed because it is viral(vogue). Those are the kind influences a serious collection of critics need to be able to shake up if they want to get anywhere. They need to if they want to stop making a mockery of the artform and the meaning behind words like "innovation".
And as to why it might be the ultimate sandbox game, pretty much no other sandbox style game (GTA4, Just Cause 2, whatever qualifies) allows you to literally destroy a world down to the bedrock if you want, and rebuild it in whatever shape you want. That, combined with mods for all sorts of crazy things, combined with good terrain generation are some of Minecraft's biggest strengths in my opinion despite whatever shortcomings it may have.