Many seem to choke on the 700m size of the new Enterprise 1701, the Narada went back and screwed up the timeline. It has been said that this new film is in same chronology as the Enterprise Series with Archer... if you remember he found the Borg remains in one episode maybe Starfleet had already started changing due to that.
The Kelvin is a good example of that, it has a crew complement of 800 which is twice what the Enterprise of TOS had, and it is only a Survey ship. Plus it had a large complement of shuttles an escape craft as it would need loads to evacuate and save 800 crew. Which we know happens as Pike himself says so.
We have Archers Enterprise Series then we have the new Star Trek film... ANYTHING could have happened in the time between (100yrs or so).
Everything after the Enterprise TV series is now null and void in this reality, JJ and the script writers can do pretty much what they want.
Some have produced lavish diagrams and pictures to try and show the ship to be smaller... with no success.
Even with all the evidence supporting 700m certain individuals will continue to whinge about the new larger size even though there is nothing they can do about it.
It is 2400ft long deal with it people and move on.
Mark
P.S Just ignore them Disillusion they seem to think the Enterprise belongs to them lol.... they don't make the decisions.