Can a tac be just as good as a tac in raptor or bop, in negh'var?

Define good.

Will he deal decent damage? Yes.
Will he deal as much damage as in a raptor, or even BoP? Not likely.
Will he live much longer under heavy fire than in either of those ships, slugging it out in prolonged exchanges? Definitely.

He could even do decent damage, be quite tough, and provide assistance to other ships, all at the same time.

It's all about how you define good...

To give you an indication: it's perfectly viable, in pve and entry-level pvp, to run dual heavy cannons/turrets on continuous high weapon power, and live, throughout an elite STF. You'll just have to deal with the small number of tac boff slots...

You can do great damage in raptor as well a BoP.Tacs can fly any ship really.

That is if you are a Tac.

General rule of thumb for Capital Ships (Bortas, Odysseys):

1. They are designed for prolonged combat, not hit and run tactics.
2. Bigger ships do not mean bigger guns - just more energy to use them.
3. They can dish out and take significant damage over time. Especially the klingon ships. Their survivability are damned near epic when compared to thier fed counterparts.
4. They are slow elegant beasts. Better for engineer's and science IMO than tac.
5. They are effective against multiple large targets at the same time.
6. They are MASTERFUL under the command of an engineer, as a TANK, tying up an opponent or small fleet while your team-mates destroy them. Under a sci toon, they can be the ultimate support ship.

As a generic Tac player, klingons are better for overall damage than fed - even more so in a BOP. Bops have a cloak and are perfectly suited for stylized hit and run attacks.

I run with a Siege Destroyer - the Gurumba. For overall sustained output, she's pretty good, and has a lance for those stubborn gateways and nanite generators.

My two bits worth.

Admiral Thrax

This is not true it all depends on how you are stated.My Fed Tac can rip apart anything.

*facepalm* You missed my comment on a generic tac player. No biggie.

Of course a min/maxed fed can be nasty - no argument there. These are not the norm.

I bought a qin mirror raptor ( i like the extra engi over tac, i dont know what to do with that extra tac ) and i got a vor'cha retrofit, i like them both
But i tend to like raptor more