The first double-parter of episodes was great and I hoped that the remainder of the show would be as brilliant but they aren't.
I think it partly has to do with the fact that there's no build-up and no dramatic tension given that the episodes are too short for them to build up any; 20 mins, rather than 50.
You can see it in how the vehicles move. In real Thunderbirds, the pod vehicles are slow and mighty; filmed at 100+ frames/second and played back in slow motion to show the mole and firefly and elevator cars lumbering down the pod ramp to go and rescue the s*** outta someone.
In the new one, the little pod buggies zip around like scalextric cars. You blink and you miss them.
Dream big and bold and daring.