I wonder if this is built on the same platform as the Rogue. Is it too much of a coincidence that they both come out within a few months of each other? Not that it matters with platform sharing and all and of course the EX has a V6 rather than the Rogue's four.
The Infiniti G series has often - and I would add erroneously - been suggested by some as being a high-end luxury Altima. This is not even close to the truth. The G series are RWD vehicles, whereas the Nissan's are FWD. That alone sets them apart, and as such, they are very different cars in virtually every respect.
While it has many downsides, as noted by some previously in this thread - this is a luxury vehicle that uses premium fuel with a focus on performance transportation. Personally, I compare the EX to the Audi Avant A4 Quattro, BMW 3 series X wagon, loaded CX-7 or Outback. All very good vehicles. More wagons/estates/hatches, please.