Re: Wolf359 performance vs. Sector 001:
It is most likely that several of the ships there were designed specifically with such a scenario in mind: we know that the Defiant-class for sure was, and the Intrepid (not seen, I don't think) and the Sovereign almost certainly were as well. The remaining ones likely have had upgrades since then, again in anticipation of such an attack. Indeed, Starfleet felt comfortable having a very powerful, new ship sit the battle out.
Wolf 359 was a complete surprise against an enemy of unknown capabilities. Starfleet knew the Borg would be back, and had been preparing for years.