In the latest patch(actually 3.011 i think), they are a bit slower(they were getting the player's 40% speed boost), so they will be slightly easier to chase down. Honestly though, I agree that the range on the daggers is a bit high(I'd advocate for about 21k or so max personally or them being much slower).
What I found worked rather well for defense against up to about 10 or so daggers was a single spire(though with the speed nerf, zeniths would work as well). It would usually get knocked down to about 85% or so after killing 10. Of course this was a game where I was planning on using the fleet starships anyhow, so I already had them unlocked. Other good response types are any of the really fast ships(autocannons, space planes, etc), to get in there and kill them fast.
Don't worry about complaining about them, I think they still need a bit of polish as well, they are pretty new and haven't had as much feedback as most of the other features
.