The Intrepid Class was the Fastest and the most advanced ship
...But whether she had any respectable firepower, we don't really know. Her phaser beams may have been wimpy, kickass, or anything in between, as we only know their rate of fire and nothing else.
In First Contact,the Enterprise-E displayed amazing firepower something not rivaled by any other ship
How so? After Picard gave inside information on where and when to fire, every ship type seemed to contribute more or less equally. The Akira
pumped out more torpedo fire, the Norway
fired longer phaser pulses, and so on.
And being "advanced" is just another name for being "untested"...
Voyager made circles around a massive Borg tactical Cube many times.
But to no avail, because there isn't a backside to a Borg Cube.
In general, maneuvering doesn't appear to make much of a difference in Trek fights.
both of Voyager and Ent-E had the most durable shields of all the ships of the franchise
What was durable about the shields of the E-E? They went down in battle fairly quickly in ST:NEM, doing no better than their Romulan counterparts. They played no role in ST:INS, as the Briar Patch negated shields for all the fighting sides. And in ST:FC, they deflected a single Borg attempt at locking a tractor beam. None of that appears particularly impressive, in comparison with, say, the shields of Kirk's TOS ship, or those of a runabout.
...Now, a fleet of runabouts would probably defeat anything, if the durability of those things against the worst the Dominion can muster in "The Die is Cast" or "Treachery, Faith, and the Great River" is any indication!
There is no reference on any series or comparison of how powerful a phaser beam is or even its yield...Phaser are determined by the model creators,like Rick Sternbach who said that the Galaxy and Intrepid have mark 10 phasers(something very poweful).
so having the ability to fire many arrays at the same time is clearly a sign of power compared to the Akira who has just 2 or 3 phaser arrays or the Norway and Sabre.
The Akira did not do anything special it fired a respectable spread of 4 photon torpedoes that is it,the Sovereign and the Intrepid can Fire a lot more as seen on screen.
Speed does influence the balance of the battle,the Uss Defiant survived against a relatively stronger overall vessel like the Neg'hvar or Dominion warships thanks to its speed.
The Ent-E suffered large amount of beating at the hands of the Scimitar and its shields were durable,just count how many torpedoes and disruptor blast the shields survived that was impressive the same for Voyager against relatively stronger vessels.
i also want to add that the Intrepid has multi-spectrum shielding stated in season 6 of Voyager and multi-phasic as well stated in season 2,that type of shielding greatly improved performance in battles.