Well, he was able to disable both in his first attack. But the Starfleet crew was somehow able to restore weapons functionality very quickly, so that some of the guns came back almost immediately after the engineer said they had gone offline... (A case of bad editing, I guess.)
In the second attack, Nero aimed at the shuttles almost exclusively, until Kirk began the ramming run - and for some reason or another, Nero didn't manage to fire at the ship at that point. Out of ammo, perhaps, or then proximity problems.
That balances the equation a little bit. It doesn't explain completely why the Kelvin was so much more durable than ships 25 years later. We're probably best off claiming that Nero improved his warheads or aim, although we could also argue with Pike that Starfleet had started to get lax on matters of carnage, and perhaps now fielded ships with inferior damage control capabilities.
Timo Saloniemi
In the second attack, Nero aimed at the shuttles almost exclusively, until Kirk began the ramming run - and for some reason or another, Nero didn't manage to fire at the ship at that point. Out of ammo, perhaps, or then proximity problems.
That balances the equation a little bit. It doesn't explain completely why the Kelvin was so much more durable than ships 25 years later. We're probably best off claiming that Nero improved his warheads or aim, although we could also argue with Pike that Starfleet had started to get lax on matters of carnage, and perhaps now fielded ships with inferior damage control capabilities.
Timo Saloniemi