Not really -- the capships don't have a very effective anti-fighter weapon. Both flak burst and the magnetic thing aren't very effective.
Yep, the flak burst ability is a waste of a perfectly good ability point that could have been used for the superior shield ability or the gauss gun ability. (And it's a waste of antimatter to use.)
Flak frigates are really useful.

I agree with multi, it would be nice if your intire fleet wouldn't be filled with just capships. removing the Fleetpoint requirement will help a lot with that.
Which wouldn't solve the problem. It would just allow you to build even more cap ships, since you could get them much more easy (and you still get frigates too).
There needs to be a counter for massed capital ships; something that makes you as a player want to have a more well-rounded fleet. Fighters are one way to do that, although the Flak Burst ability on the Kol makes that a difficult proposition. I still think a better way is to make capships have narrower firing arcs, so that fast frigates can swarm them at close range.
I would be all for narrower firing arcs. (Even better, moddable firing arc. Pretty please?

)
Imho capships should either get some upkeep cost, or an increase in building costs, supply costs.
A soft limit is much better then the current (research) hard limit.