I guess by 'has Jack Silkstone's fingerprints over it', that's a reference to the fact the show is effectively a throwback to a variety of attractions, past and also present? Archie Stephens also did the music for it. How much creative involvement they had is something is not clear - were they approached by Thorpe and told "This is what we want, do this please", or if they were involved in deeper discussions.
In any case, the whole point of Legacy is that it's a fire and light show that was set to music from old attractions.
As for the show, it's...fine. I think that's harsh on the show in many ways: a 7 minute long show with fire, lights and loud music is always going to be good. But it's perhaps one of my least favourite such shows that I've watched.
Let me explain. Most of these types of shows go one of two ways.
The first way is that they tell a story. The fire and lights and whatever else add to that, but the story comes first. Examples are the fire show at Phantasialand's winter event, and the end show at Movie Park Germany's Halloween event. Both fantastic.
The second way is that they don't care about a story, and just go "Here's a ton of fire, lights, music and whatever else, enjoy". Example are Tulleys' Wastelands show, and even the mini fire show at the Fearstival Arena at Thorpe last year. Again, both great.
Legacy tries to have it both ways. There's an introduction from a character (Fear I think), which is a bit difficult to hear with the voice it has. I don't really get the story still, but it's basically 'Fright Nights has been going for 20 years, here's the legacy of it'. Then after that, you have 5 minutes of fire, lights and music, which blends and bootlegs/mixes different Fright Nights soundtracks and soundbites. Then you get story again, and a terrible ending of Perfect Day playing (which is meant to be like an exit song, but no one realises the show has finished, so are still awkwardly waiting for the finale which has already happened).
The trouble is, with the 5ish minutes of fire, lights, etc, it has too many lulls. These lulls happen when they're transitioning from one attraction's audio to the next usually, and sometimes contain some vague story idea. Lulls and breathers are fine in these types of shows if they serve a purpose. But they don't here - there's no story happening, and there's not been enough preceding or superseding it to justify it.
So that's my main issue. They've tried to merge two different ideas for a fire and light show, and got the weaker parts of both of them. That still creates a decent show. But still misses the mark for me personally. I also think it's a bit too fan-servicey, which will confuse many people.
After the first show, I overheard a lot of blasé and disappointed reactions. We also saw the 9pm show and it was very thin with numbers. Harder to know what the reaction was. But with a terrible ending, there's certainly no applause.
It's important to note it's still be tweaked. With the delays, they only had one proper test run of it all, so it will change and improve.
As I say, it's fine, and it's great to have a proper fire and light show at the park. But I'm unsure how well it will resonate with the wider audience. And I think it's too fan-servicey for it to truly be a hit. Hopefully it's popular enough to justify bringing back a similar idea on the beach next year, but maybe a bit more polished.
tl;dr - I enjoyed it, it's a good addition to the line up, but not my favourite thing.