Thorpe actually has a pretty great coaster selection for a European park, its primary lineup is a nice collection of rides that would have been star attractions at most other parks on the continent. I know Nemesis Inferno isn't as big as Katun, Stealth is smaller than Red Force and Colossus might not be as imposing as Helix, but what other parks has got five coasters on that medium-large scale? It's true there are many parks whose main star attraction is bigger and better than anything at Thorpe, but the next greatest coaster in those parks tends to be smaller than Thorpe's second-largest, and the next after that can't stand up to Thorpe's third largest one, and so on down to five. The overall quantity and average quality at Thorpe is better than most other parks outside the US, even though it lacks a true stand-out ride.
But I too wish they would try something else than the theme they've been going for over the past decade or so: Grim, futuristic Urban fantasy/dystopia, whose main backdrops tend to be industrial buildings in various stages of decay or disrepair. Or translated into practice, "The cheaper we build it and the less we maintain it, the better it fits the theme!". Half Rusted Shipping Containers: The Ride practically makes itself, you just need to buy some defunct containers (can basically be bought for the scrap price) for theming, strew them about and then let entropy take its course. But it makes an awfully samey visitor experience, and the line between immersive theming and an impression of disrepair comes down to how well you manage to sell the other aspects of the setting. I think Thorpe has some great potential and some great attractions already in its lineup, it just needs to abandon the dreary, derelict image instead of actively pursuing it.