The ship is so much fun to pilot it's unreal.
It has extreme range and burst damage, and lets you instantly remove any threat from the battlefield, provided you have FMR charges to spare. Pegasus feels very "tactical" as a flagship. You don't need to have snap-fast reactions to maneuver or micro 7 weapon groups at once, piloting is pure decision making. You decide where on the battlefield you should be, which target is the priority, and how many reasources are you willing to allocate to neutralize it. And you need to think in advance too, since you are slow and dependent on FMR charges for damage. Engaging multiple smaller ships is a pain, but you have the rest of your fleet to take care of it. You only need to focus on big targets. It's like an Astral/Legion, but much more satisfying, because the strikes are delivered instantly, without having to wait for bombers.
Just did my first proper ordo farming with it, which I normally detest, and the experience was amazing. No longer do you have to dance around Radiants with avoid orders for 10 minutes to chip away at escorts. You get your flagship to it, and remove it from both this world and the next, so your sidekicks can finally get a fair fight while you recharge.
Everyone should try it out if you haven't already. In AI hands it's very mediocre, but human decision making turns it obscene.