I have no problem with Nero's beef with Spock. If you were off Earth and it was utterly destroyed (all 4 billion dead) you might find the smallest reason to blame someone for it..and that is what he did..and I would do too.
Rob
I would definitely be angry and want to lash out at that instant, but ultimately I'd realize that "oh wait, Spock was actually trying to help save my planet and simply didn't get there in time." It's not like Spock had it in for Romulus, or the supernova was engineered to wipe out his planet or anything (at least the movie and comic never establish that as his rationale).
To be bitter is one thing, but to take it to the level he does-- wiping out Vulcan and dozens of Federation starships-- all because some some scientists weren't able to stop a huge freakin supernova fast enough?
Hell, even HE didn't get there fast enough to save his wife and children. So the supernova obviously caught everyone by surprise.