I've been to Splatter Park (just outside columbus), but not for a few years, their fields were decent, fair variety. But the reason i will never go back, their paint SUCKED, it was largely oblong, everyone that day was complaining about it that day (had to run largest bore barrels). That and the pricing, its somehow cheaper to rent equipment. It seems they don't like ppl to bring their own gear. But they have a decent deal if you know for a fact you will be shooting a full case, but i can't seem to find their a-la-carte paint prices.
Blast Zone (between Dayton/Cincy) has some decent fields, i just hope this winter/spring they didn't cut out too many more of the 'wrong' bushes, or it will just be a bunch of smaller speed-woods fields. Pricing there is a bit steep, i've only gone a few times when i've had 'free passes' that gave me free field and air, paint was something like $32-36 for 1k rnds (apparently now is $40), and they upcharge ALOT for smaller amounts. (FPO) (last year their paint was also crap, always lots of dimples)
(outside of Xenia, 1h SW of columbus) i've been to lots, and even help ref/field revamp work. Owner is great, its BYOP even, paint is about $60 per case, usually decent quality (they shop around and test different types every so often). Their Achilles heal right now is they don't have much walk-on traffic, so general you have to call ahead to see if they will be open that day. And they don't take credit cards (no electric or services) and they badly need to update their website/pics/vid...if only i had a helmet cam i'd help them out with game vid.