I wonder how many of the people here saying they're going to wait for customer reviews actually would have boycotted DA2 and ME3 after reading customer reviews.... My guess is that anyone vested enough to post on these forums would have had a hard time doing so.
Keep in mind, those games currently sit (at least on the Xbox 360) at a user score of 4.4 and 5.7 respectively. That's absolutely retarded scoring! So you guys go ahead and trust those idiots giving out absolute 0s on good games and perfect 10s on flawed games, but I sure as hell won't! I don't always agree with the professional reviews, but I find them a whole lot more accurate than user reviews.
DA2 yes (not boycott, but i would have waited for it to be cheap, which didn't take long). I probably would have still bought ME3, I was too invested in it not to, but I could have been more prepared for the ending at least.
To respond to your other point, I can't speak for everyone, but for me reading reviews isn't about getting another persons opinion, its about getting access to information on the game that isn't wrapped in a PR blanket. I do it to see unfiltered gameplay and get hard information that the Publisher didn't share themselves because it might not be wholly positive. I form my own opinion based on that information instead of the cherry picked info the marketing gives me. I couldn't care less about scores.
I especially appreciate Digital Foundry for their performance reviews. Devs and publishers often mislead on that stuff, and thankfully for them most people don't care about performance enough to criticize them for it. But I do. My point is, those reviews have nothing to do with opinions or biases, its just cold hard fact finding. There is great validity in that, and info like that can be found in just about any review if you know how to filter it out of the opinions.