Yes it's worth it, but only because of tactical laser.
See what this does it makes your point defense into a "dual purpose" battery. Tactical laser is a good small energy weapon in itself due to it's combination of small OP, long range and great flux efficiency. Having enough of those firing together on an enemy is a serious amount of damage. Integrated Point Defence allows you to devote all of your small energy slot for tactical laser rather than splitting them into two groups one for anti-ship and one for PD. Then with one stroke you turn your massive laser battery into a PD battery as well giving you fantastic amount of PD and so more use out of each tactical laser.
The catch is, this thing is only worth it for ships where a large amount of their OP is invested in small energy slot weapons, this is so the cost of this hull mod is spread out over more tactical lasers and thus the cost per tactical laser is lower. So that's basically Medusa, Odyssey, Paragon, Astral and a maybe for Wolf and Eagle. Not worth it on any other ship.
Here's my Odyssey, if you add up those broadsides
Port
75*5 + 227*2 = 829 DPS
Starboard
75*6 + 227 = 677 DPS
And I can afford to pay for Integrated Targeting Unit to boost the range of both the tactical lasers and pulse lasers to 900SU and get advance turret gyro to make the tactical lasers even better at catching missiles and fighters.
A plasma cannon is 562 DPS each for 899 flux/s. An Odyssey with 3 plasma cannon would be hard pressed to mount anything else worthwhile on the small energy slots due to high OP for the cannons themselves and all the vents and capacitors you need to support such power hungry weapons. And then all you're getting is 1122 DPS for Port and 562 DPS for starboard, which isn't even that much more DPS than my all laser setup. Not to mention you'll have bad PD, bad flux/damage ratio and is even out ranged by all laser Odyessy since Plasma Cannons are 700SU range while range boosted lasers are 900SU