^^^You're right that Wild Adv value is great, and they have been adequately adding flatrides and waterslides to the park. Unfortunately so has virtually every other park out there, even smaller parks. Look at Holiday World in Indiana, smaller than Wild Adv with a world class waterpark, arguably the best wooden coaster collection on the planet (not to mention adding a brand new wing coaster named Thunderbird this year) and it's adequately adding new flatrides often.
Waterparks are very popular and great for families, so it's very commonplace for theme parks to constantly add on attractions to their waterparks. There are alot of people like me who are 'dry park' people, and are looking mainly for the coasters; The waterpark is a whole new planet that many people like myself have no interest in visiting (like I said, still they are very popular). I've ridden 239 coasters in the US, so I'm very keen concerning the quality of coasters; Lets bring down Wild Adv's coasters:
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Twisted Typhoon: A very typical cheaper made cookie cutter suspended inverting coaster (nicknamed a Hang N Bang) made by the company Vekoma. That type is often known for giving a rough ride (which it does)
Boomerang: An unbearably rough VERY commonplace facsimile shuttle also made by Vekoma. Some of these inverting shuttles are smoother than others, but unfortunately this one is brutally rough.
Cheetah: The only custom coaster in the park. It's a CCI wooden coaster, that's a tad rough but not too bad. It's pretty fun.
Swamp Thing: Again Vekoma, ugh! they call this one a 'Hang N Bang Jr'. It's an okay ride that's more of a family coaster.
Go Bananas!: A commonplace rough (lateral G's) wild mouse made by Maurer AG.
Viking Voyage: A carnival-esque coaster that's basically a fill in for Herschend to say "Hey, we got you guys a 'new' coaster!" The coaster is just okay, but it's a weird fit for Wild Adv with it's wild mouse-like style (and Go Bananas! already there).
Ant Farm Express: A good Vekoma junior coaster (Vekoma is good with kiddie coasters, with very FEW exceptions on the adult coaster side).