It's not good. Honestly for 40 quid really not good. Park was quiet so I understand why it felt a bit flat but they had 4 coasters down until 2pm (Runaway Mine Train, Go Gator, Kumali and Dino Roller) with Go Gator slated to open at 2 (unsure as I didn't go near) and they were working on Kumali and Runaway Mine Train the entire time I was there with Runaway opening just after 2.
Rides that I did: Velocity. Rattled a bit and the launch was underwhelming. This was my first ride on it in 15 years and the only ride I did today that I'd done before. Only one train in sight so throughput would be baaad if there was any sort of numbers
Hero. Pile of junk. Rattled, banged, unpleasant. Not the worst ride I've ever done and not even the most painful I've ever done at Mingo but urgh.
Mumbo Jumbo. Shoulder killer and also very unpleasant. Really strikes me if they got Gerst to build some cars for it that it'd be a good ride, but the S&S ones make it awful.
Zooom! Plodding. Shuffling. Swing action very poor (lack of damper maintenance?)
Twistosaurus. Possibly the worst full size SBF Visa I have done, poor layout but not harmful.
Pterodactyl. Enjoyable enough, decent speed on the spin.
Runaway Mine Train. Not Zamperla's finest hour. I thought at first it was the Big Country Motioneering mine train but that is at Billing. Poor banking, slammed the lift.
Other things seen but CBA: S&S Shot and Drop Tower, Pirate Ship, Rockin Tug, a broken train, a broken monorail, big flume ride, Grand Prix style ride. If you can get in for £20 and be happy to do 3 or 4 hours and leave, maybe yes. Full price? No. Not unless you're cred hunting.