Game reviews are personal opinions, not facts set in stone. Perfect example? Zelda: Ocarina of Time. When it came out, game reviewers all basically called it the best thing since sliced bread. In reality, it was "good" or "average" at best. I haven't cared what game reviewers have said about a game since then.
Don't forget a few years ago too. When gamespot fired a reviewer for giving a game a "low" score when the game publisher was sponsoring the site and advertising that game everywhere. Then a bunch of other reviewers left gamespot because of the fact that they couldn't give "honest" reviews any more.
So, in essence, game reviews mean absolutely nothing. They are personal opinions.
Read the reviews of Duke. The vast majority of the review is spent talking about how "offensive" Duke is and slamming the character for being the character. The arstechnica.com review goes on and on about how "offensive" Duke is and how "terrible" the game is for "objectifying" women. Then the reviewer admits to being a "big fan" of Family Guy. How can anyone take that review seriously? Not only that, but complaining about how "offensive" it is and "objectifying" women in a Duke game leads you to wonder if the reviewer had played the original. Same thing with the Alice: Madness Returns reviews. Reviewers complaining about the platforming and puzzles, as well as the music. Those three things are what made the original game such a hit with fans and made it financially successful enough for EA to finally bring out the sequel. Its the same with DNF. They complain about everything in the game and say its "nothing" like Duke 3D, when it in fact is. Plus they're all trying to be politically correct "OMG thats wrong" reviewers. Look at IGN's review. Then look at their review of Mortal Kombat. They actually complain about the level of violence in Mortal Kombat. Did they play ANY of the previous games? I mean, seriously.
Reviews mean absolutely nothing at all. They're just a single persons opinion. They should be taken with a grain of salt because they in no way reflect how YOU will feel about the game yourself. Let's not forget that a lot of these reviewers also recently gave Crysis 2 glowing reviews talking about great it was and how spectacular the graphics were. We all know how that turned out

Basically Call of Duty with aliens and the nano suit. And the graphics weren't anywhere NEAR as good as the original, except for the character models.
Anyway, I love Duke Nukem Forever. It's fun. People complain about two weapons at a time? At first I thought it would be bad. But as you play the game, you find that you always have both a weapon you NEED as well as a weapon thats FUN. Slow movement? I guess people forgot what Duke Nukem 3D was like. Bad controls? How is the control bad? If mouse movement is not right on your system, then its your system. Linear levels? No different than the original game. People seem to forget that Doom, Quake, Duke, Unreal, Half-Life, etc., basically all of the big shooters from the 90s, had an entrance and an exit, and often hid the linearity of the level by requiring backtracking through already explored areas of the map. Scripted events? So? They drive the story this time around. Duke 3D had no real story driven scenes. I don't see how people can complain about the weapons either. A pig leaps at you and you nail it in the head with a shotgun and the head explodes and the body goes flying backward.
I honestly believe that the vast majority of people who are complaining about the game have NOT played it. The reviewers who don't like it never played the original, or already showed they don't like Duke prior to reviewing the game (again, such as Ars, where the reviewer made many previous comments in the past about his distaste for Duke) so they were biased against the game from the start.
It really is a fun game though. It plays like a 90s shooter. If you play it as intended, circle strafing, shooting everything that moves, using strafing to dodge attacks, then its a lot of fun. But if you play it like one of the many cookie cutter modern war games, and have absolutely no sense of humor, then it won't be fun.