Based on the demo 7.5 seems harsh, but not completely out of the question. If points are docked because it's more of the same, it's reasonable. It's about a point worse than metroid too, so in that sense, they are being consistent. An extra half a point to Bioshock isn't unreasonable either.
It's their undying love for a certain shooter that IS more of the same, but isn't judged by the same standards that has made them look inconsistent when dealing with high profile titles IMO.