Minecraft has a user score of 7,4, Dark Souls 2 has 7,1, GTA 4 has 6,6 and Mass Effect 3 still got 5,5. Even Civ 5 still has only 7,9 after expansions and patches. So wouldn't really read too much into that score.
Minecraft is a genre in itself and started as a one-man project - 7.4 is pretty damn good. The first "Minecraft" and thus no reference.
GTA4 was good and I got no idea why it has that score - maybe parents don't like drunk driving, sex etc in a game... there was a lot of criticism from politicians and censorship in some countries. GTA1 and 2 were 2D top-down and every GTA got bigger, better and immersive - until they dropped the ball with gta5 online. Anyway... I think censorship can get you a negative review from some people.
I got no interest in the other games, but they are ALL kinda in a genre for themselves and can't be compared at all - I'm not comparing bananas and pineapples either... I do expect a non-rotten fruit though. You gotta look a bit deeper if some game got a really terrible review score. Remember Skyrim? Skyrim had stellar reviews like civ5 on Steam, and then they aired some ideas about paid mods and then reviews plummeted. That doesn't really have anything to do with the game... just people voicing their opinion.
The only way Civilization really stands out, is that each iteration of the games doesn't bring that much new to the game. It is fairly simple no matter how much bling Firaxis brings to the mapview. If you look past all the bling and "new" stuff, then you are left with a lot of poorly implemented features. It's pretty though....
1. Spies - boring, useless and a micromanagement hell.
2. Trade routes - somewhat interesting with the roads, but also a micromanagement hell. Just get me a "repeat this action" button...
3. Religion - what's the point really? Is it in the game because it is fun or because Firaxis had to check that feature off? I don't see the fun...
4. AI - I dont mind a stupid AI because we have never had a good AI in a strategy game... still this AI went full ******...
5. UI - fighting the userinterface is the real battle...
6. Exploits - buy armies and sell them for more... infinite gold... really good in multiplayer
I get that some people play on small maps and that spies and traderoutes arent a problem there, but they are a BIG problem on giant maps with lots of cities.
My review on Steam is negative and it stays that way - same thing people did with Skyrim. I cannot undo my purchase because I'm not satisfied with the game, but I can "vote" my opinion about Firaxis and 2K... even if the game ends up being good in a year or two... It's a big fat negative from me.