Shadowlord - of course I mean a minute or two of bombardment AFTER you clear out the enemy fleets defending (which yes, could take 20+ turns sometimes). That's no different from bioweapons, since it's almost impossible to 'sneak' some bioweapons past the defenders - EVERYTHING targets those missiles as priority #1, the missiles can be blown up while still attached to the cruiser, they go slow, and if one missile in each 'bunch' blows up chances are it takes them all out.
As for environmental damage, honestly just don't use missiles - missiles (especially antimatter) will literally glass the planet and make it uninhabitable, but all the other guns are not so bad unless the planets start right on the edge (and even then, there's a 50% chance your environmental damage will push it closer to habitable)
And finally liir are just slow in a gravity well (slowest combat speeds iirc) because of their drive system which is probably why you have trouble getting to the planet in time.
Orb - yes you can claim colonies fast, but so can every other race - the AI is bad at colonization, it's not hard to be #1 for colonies unless the sadorandomizer *really* screws you over. Meanwhile you NEED double the colonies since due to civilians each one of their planets counts as at least two of yours (and yours tick down every turn)
Node cannon is overpowered against the AI, yeah I forgot about that. The ship is also extremely expensive (IIRC around half a million spacebucks for the cruiser version if you armor it and give it real guns) though and otherwise mostly useless in a fight and the cannon recharges slow. You could build a fleet of them but you'd be spending... a lot... otherwise it's just good for taking off a chunk of the first wave (after that, they are usually too close to your ships to use it again). I find it's drastically more useful on defense (have them chase a single cannon around the planet while their fleet eats missiles and node cannon blasts every time it recharges) then offense.
As for the FTL system, I hate it and think it's the worst of all FTL systems but I guess that's a matter of opinion. It combines all the bad of the human drive: can't refuel mid-flight (potential major problem early-mid game), have to deal with specters sometimes, can't realistically intercept other races, and can't fly in a straight line wherever they want (which partially negates the speed boost) but does not have the main advantage of the human drive (surprise attacks) because you need to use that stupid slow boreship first.
The ships... yeah. I do like their ships a lot, I don't think it makes up for the terrible strategic state of the race, but cheap fast (though fragile) ships strapped with more guns then you thought possible are lots of fun.