Well, Spock Prime really had no way of knowing how this Kirk would be, given he knows nothing of the changes that have occurred, so such a conclusion would be based on limited information, at best.
Secondly, and perhaps a bit of plot hole filling on my part, but we don't know the speed of the Narada. Its a mining vessel, modified, but that doesn't mean it goes faster. In addition, Nero is crazy and overconfident, to the point that I doubt he is zipping around at full speed.
I agree that better decisions could have been made, but that's based upon knowing all the facts. I'm not saying that it isn't the best decision or that it can't be made better. I'm just asking what decisions do others see that can be done?
In fairness, Spock Prime has mind melded with both Kirks and so has some sense of his potential.
There are lots of unknowns about the Narada but referring to it as a 'simple mining vessel' was silly. It makes little sense that it has enough weapons on board at any one time to destroy the Klingon fleet, all the ships defending Vulcan, and the Federation rescue fleet etc. If it can make its own weapons, how can it do that (Voyager couldn't) and how do they replenish those weapons faster than Voyager's shuttles?
Further, it its top speed was warp 3, it would not have been able to reach Vulcan so quickly from the Klingon Empire.
Well, Nero called it a simple mining vessel, so I just used his terminology
I didn't say that Narada's top speed was Warp 3. I simply stated the fact that we
do not know the Narada's top speed. Also, and my greater point, is that Nero may not have been in a hurry to get to Earth, being the overconfident villain that he is (also, an emotionally unstable one).
Finally, the Narada, as a mining vessel, is probably designed to operate in deep space, away from support, for long periods of time. The ability to manufacture its own supplies, including weapons (explosives for mining) is a practical extension of its function. Voyager, in comparison, is more of a science vessel, and not
intended for long operations all by itself. Also, I'm going to go out on a limb and say that explosives are easier to fabricate than a shuttlecraft.