I think it's good. The park is well run and has a good selection of rides and just because it doesn't have large rides doesn't mean it's boring. I have had many good trips there. The coasters are all pretty fun and the rides are great to go on with mates.
If they get the Eurofighter it will seriously rock because it will bring more people to the park and then hopefully mean they will be able to get more big rides.
And £19 for a wristband is only that during the middle of summer and to be honest it is well worth it. You get unlimited rides on anything, except the go carts, all day and with AI you aren't restricted to staying in the park. You can wonder off down the peir, go to some arcades, get fish and chips, walk down by the sea, go on the beach and then return to go on the rides again.