Here's my problem: you're acting as though the reviews are what are making you "hyped", yet I would think that anyone who's been paying any attention to the series would be hyped merely by the fact that it's a new Grand Theft Auto game. Note here, dragonfliet, that I'm not picking on you, since a lot of people have said this a lot of times about a lot of things.
The problem with video game reviews is that time changes things. Ocarina of Time was likely very deserving of a 10 back in 1997 or whenever, but would you say the overall game holds a candle to Wind Waker or Twilight Princess? Similarly, who's to say that Soul Calibur really should've gotten a 10 score, since each game since has had virtually the same gameplay but have gotten lower scores.
Put plainly, reviews of anything, not just games, are a matter of personal bias. The people who are paid to make video game reviews aren't paid to do so because they're generally right; they're paid to write reviews because that's their job. Let me put it this way: I give GTA4 a 10 out of 10, but I haven't read anything about it, I haven't seen any gameplay, all I've seen is the first trailer and I'll likely never play it. Does this make my review any less reliable than someone from IGN or GameSpot or EGM? Probably not.
Let me put it another way: when Gene Shalit or Gene Siskel or Richard Roeper or Roger Ebert reviewed a movie, people generally take their opinions to heart and make a decision to see a movie based on that because what they said or wrote was usually on the money and they've built a reputation based on that...that's why they've all been on TV, FFS. With a game like GTA4, it was very likely from the day it was announced that most people intended to buy it or play it regardless of what some no-name on some website had to say about it. I mean, I've never heard of Hilary Goldstein...have you? In all likelihood, she is some English major from the south California area who got hired a few months ago and was deemed to be worthy of a big piece like GTA4.
Ultimately, I don't think it should matter what someone on some website or from some magazine says about some game, or any movie for that matter. The experience is yours and yours alone, and if you can't make an informed decision about what game you should buy or play then perhaps you shouldn't even bother.