Well, I'd imagine the review is aimed more at casuals, actual gamers are fairly rare, and casuals just kind of want to be lead as opposed to having to explore, make desicians, and risk missing something. The review doesn't surprise me when really that's what most people playing games are increasingly like.
When it comes to "Iron Sights" it's very similar. I'm not a big FPS player, but the big thing with Iron Sights is that as implemented in most games they show you exactly where your shot is going to go, making using them almost a "point and click" affair. If you have Iron Sights, line them up for even a second, and hit the button while they are in line, you score a hit. It makes things much easier than actually having to eyeball things and aim, especially when things get hectic.
Ironically Iron Sights is so popular because games rarely take into account things like gravity, the natural fall of a bullet, and similar things. Half the point of people liking them is that they are usually a way around the variables put into the game's physics engine (if they exist).
That said, I don't begrudge casuals playing their games, I just wish people would lay off trying to make every game have casual features. Halo is enough of a casual "Bro" game as it is without making it even more so.