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"If you don't like Unity, you probably won't like GNOME 3!"
This is a rather dubious statement. Personally, I am quite fond of Gnome 3, but hate Unity. I know other people who feel the same way. I also have met some people who like Unity but dislike Gnome 3, and those who dislike both.
I'm not trying to start a flame war over which is better, but rather I think it's important to note that they are quite different beasts, and someone may like one but not the other.
I happen to be one that likes both Unity and Gnome3; I gave them both a proper chance without any preconceptions I was even running XFCE for a while but eventually figured it wasn't for me.
It seems certain people that complain about Unity and Gnome3 haven't really used them with some just riding on the backs of what others are saying. As for Gnome3 being like Unity? That's like saying oranges are like nectarines.