At this point I see Star Trek XI as what I call a pseudo-reboot. What I mean by this: In the timeline that that Spock prime came from, the main events of TOS, TNG, ect, did happen, but other details where different. For example, the design and size of Federation ships.
The Narada looking like no Romulan ship we had seen before is fine with me. I just assume that it is a highly specialized mining ship, built for function instead of aesthetics.