Anticipation...for a score

Many people try and argue the scores given to games by review companies based on their own experience or what they have heard about the game. How much does the anticipation for a game effect the scores? If someone has extremely high hopes for a game how are they supposed to review it when their original standard for the game was unreachable. If one expects perfection the game will be far less than they hoped for and this happens alot within the gaming community when people become infuriated at review scores. How many scores have been efffected by having a large amount of anticipation or being a new IP. A game such as army of two had terrible review scores so now with a sequel even if it's moderately good it will be a huge improvement over the first which could possibly effect the reviews by making the second game seem much better than the first. An example of the opposite situation is Gears of War 2. Gears of war (the original) had innovative gameplay and popular multiplayer. In 2009 Epic games released Gears of War 2 and it got very good review scores which are fine for the single player but the multiplayer was and arguably still is terrible. There was an uproar from the community but Gears of war 2 kept riding on the brand name and riding on an IGN score of 9.5 and a similar 93 on metacritic. Don't get me wrong i love playing gears of war 2 with the updates despite the chainsaws overpower in multiplayer. A game can sell great because of a review or because it's a sequel to a good game. Army of two was scored very low but the only problem is some movement issues that take some getting used to. It's no Orange Box or Mass Effect but it's definetly worth playing. GTA4 was given stellar reviews despite the absolutely horribly slow start to the game driving nicos cousin around and the obvious issues with car handling. Anticipation for a game can get a game a score it doesn't deserve as well as a big IP. So next time you see a review score take a look at the game for yourself before believing everything you hear. I would also like to bring up that 5.0 is a score for a game that has absolutely no merit any score below 5 or at 5 is not mediocre. A 1-10 scale is the same scale as a school grading scale  a 5 is technically the middle of the scale but really it's failing a 7 (like a c) could be considered average but is still written off. Anything below an 8 (or a B) is what people will want to buy and below an 8 has almost no sales because of the score. What is the point of having a 1-10 scale when it can be compared to a school scale? when will the middle of the scale truely be a middle (mediocre) game.