I'm writing this the night of my first day with my new Sentra. I will give just a simple summary of what I've observed in the first 24 hours. I like the exterior. It's small-looking on the outside, but really big and roomy on the inside. The trunk space is amazing, considering it doesn't even look like it has a trunk from the outside. The engine makes a lot of noise upon acceleration, but that's the only flaw I've seen so far. It handles great, it accelerates great (minus the noise) and the interior is smartly designed. I should have no trouble parking this in the city because it's compact, but it doesn't feel like that on the inside. Overall I'm very impressed on the first day.
The exterior design and interior design are splendid. I love the placement of the gear shift. The air vents are huge, which makes warming up the car on a cold day really quick and easy. You sit up high, which is good. Lots of little compartments up front to store stuff.
Find a way to make it less noisy when it accelerates.