Generally, teleport raiders are not very strong ships. They're best used for sniping off key enemy ships and structures and soaking up hits for the rest of your fleet.
When I've used them, I've pretty much had to micromanage them excessively. However, micromanaging teleport raiders undoubtedly will have very strong results. I often manage to almost completely neuter a world sans the warp gates (which are immune to minor electric ammo) with a few waves of teleport raiders, making liberal use of the tbs-friendly pause, to continually kite every single thing that has a limited range. One of my favored strategies is to use a stack of teleport raiders to draw ai ships far out of the planet's gravity well, and sweeping in with the rest of my attack fleet to assault the world with little resistance.
As they are so cheap (less than half the cost of a fighter of equivalent mark level), and travel so fast (they can move between planets in less than a second or two)they're extremely useful in clutch situations because they can be remade so quickly.
However, they are very, very fragile, and a fortress, flak guardian, lightning guardian, or a heavy beam guardian can pretty much decimate your fleet of teleport raiders if you don't focus on them. If there are any of said above ships, go after them immediately, except for maybe the heavy beam guardian, which, as a result of poor teleportation pathing in the game, can often wipe out your entire stack of teleport raiders. I haven't used teleport raiders often because of my finding better stating ships, such as polarizers and normal raiders, so I'm not sure whether or not this has been fixed.
So, teleport raiders are great for an offensive early game, but become increasingly less useful with the more anti-blob ships and guardians, and are almost useless on homeworlds as the homeworld guard posts often hit so many of your ships at once, too many will probably die on the first burst to deal any significant damage.
So, unless you really like sniping off guardposts with kamikaze teleport raiders, it should be a path less traveled in favor of more general use ships.