My love of the movie is well known but that doesn't mean I'm not blind to its faults.
So with that in mind... and leaving aside the question of what the Kelvin encountered...
Black Hole #1
Vulcan is turned into a black Hole. Delta Vega is so close that Spock Prime can see what happened to it.
Q: Why isn't Delta Vega sucked into the black hole?
Q: How long until the entire Vulcan system is sucked into the black hole?
Q: Why did Kirk and Spock Prime not experience any form of time dilation?Since:
a: they were so close to the Vulcan Black Hole Event Horizon.
b: black hole temporal effects are the mechanism by which Nero and Spock Prime travelled back in time.
Black Hole #2
Q: Where was the Narada in relation to Earth and Titan when the Narada was turned into a black hole?
Q: How long until the entire Earth system is sucked into the black hole?
Q: Why did the Enterprise not experience any form of time dilation?
Since:
a: they were so close to the Narada Black Hole Event Horizon.
b: black hole temporal effects are the mechanism by which Nero and Spock Prime travelled back in time.
Have at it.

So with that in mind... and leaving aside the question of what the Kelvin encountered...
Black Hole #1
Vulcan is turned into a black Hole. Delta Vega is so close that Spock Prime can see what happened to it.
Q: Why isn't Delta Vega sucked into the black hole?
Q: How long until the entire Vulcan system is sucked into the black hole?
Q: Why did Kirk and Spock Prime not experience any form of time dilation?Since:
a: they were so close to the Vulcan Black Hole Event Horizon.
b: black hole temporal effects are the mechanism by which Nero and Spock Prime travelled back in time.
Black Hole #2
Q: Where was the Narada in relation to Earth and Titan when the Narada was turned into a black hole?
Q: How long until the entire Earth system is sucked into the black hole?
Q: Why did the Enterprise not experience any form of time dilation?
Since:
a: they were so close to the Narada Black Hole Event Horizon.
b: black hole temporal effects are the mechanism by which Nero and Spock Prime travelled back in time.
Have at it.
