I would rate Terraria with a seven, since Terraria 2 was a bit different with few new elements and Terraria universe was sudden too hard for me, too logical, I had to use more strategy in this game. This made me to get bored, lose my interest and move on to another and that was Minecraft.
Haven't played this game but I heard a lot of people talking about it all over different forums online. I am curious about it, but not curious enough to invest my time on it by learning the game from the ground up, as well as purchasing the game itself on Steam. I think I saw it was on sale or something when I was browsing last night. But I have other games in mind to spend on.