I spoke to some friends who had some complaints about Star Trek that I had not thought of, and -- though I have not looked around that hard -- did not come across on the internet either. They are barely budging my high opinion of the movie but I think it is worth giving them some space.
Why didn't Eric Bana, after traveling back in time 139 years, go back to Romulus and
a) Warn the planet that this star is going to go supernova as whatever he changed about this timeline should not change that and
b) hang out with his wife and child, depending on how long Romulans live (Vulcans seem to live a long time)
Also: Leonard Nimoy's plan was to use the red matter to keep this star from exploding and destroying Romulus, but it accidentally sent them back in time. Was it going to send the exploding supernova back in time as well, destroying Romulus back then? (this one is maybe less of a complaint that something I am just sort of unclear about).