It’s hard to say with the Goliaths; their ‘pre-attack’ roll is a little odd at times, they have low defence and 7 points isn’t cheap for an infantry… but they potentially have a good attack against vehicles, and fairly decent against infantry.
At range 2 they have less than a 50% chance of their Remote Control working (Range 3 - 25%, Range 4 - 11%), and then they still have to roll 12 Veh / 8 Inf dice against the target to see if it even does anything. It has the possibility of being a bit more effective at medium range than say a Panzerfaust/schrek, and is good against both vehicles and infantry, but has some drawbacks, or at least oddities.
I haven’t used it enough to say whether it’s worth using or not yet; many aspects of it I don’t like, but at least around here the potential of its attack is useful as a psychological weason.
The Fallschirmjager aren’t anything special; nearly identical to UK P/Ts but with 1 less close assault, though if you’re playing year based games you can at least use them 1939+. They’re good for taking out the usual things; depots, lone mortarts/commanders, etc, or securing the objective earlier on. They’re no screaming eagles, but they’re decent balanced pieces.