Sorry haven't had time to read the whole thread but what i would say is i think it is a bit pot luck with these places.
We did a Park resort this summer and i can truly say it was the worst holiday of my life! Dirty, fly infested, the entertainment was worse than shocking - it was on Mersea Island in Essex so my tip is avoid the place at all costs (and yes it was cheap and i therefore didn't expect 5* but did expect it to be cleanish). The bolier was dangerous (bits missing), the cooker broken, drains blocked the list is endless and i really must do the letter of complaint!
I would consider one of the bigger companies for all the reasons you are thinking about it for, but would set expectations low, as someone said earlier 'sticky' is probably a good mindset to go in with
some people love it though so it's an each to their own senario i guess.
To answer the question though i would look but can't promise i'd be rushing to book
Camped at a Hoburne resort though this year who also do all the vans / chalets etc and found their entertainment and clubhouse etc much nicer but they are more expensive.