I think you need to do what most others do, select a couple of different venues based on the sales gab which look as though they are the kind of waters you are looking to fish and then ask on here, whether anyone has any experience of venue 'X' or 'Y'
Assess the feedback, compare it to the sales pitch and make your own opinion.
Further to what Budgie has said, even if 2 people, with the same goals, go to the same venue, if one has an absolute stormer of a week, then he will conveniently overlook any problems he had, where as the other, if he had an average week may well highlight those problems.
Case in point.....
4 of us shared a smallish lake the other year which had one decent swim on it.
The guy fishing that swim had a reasonably good week, including his first 40, he was ecstatic and wanted to rebook another week straight away.
The other 3 of us, who all caught reasonably well, thought that it was overpriced, massively understocked, not well kept or presented, was overly restrictive with 'on' and 'off' times and the accomodation was 10 miles from the lake who's on site 'diner' was more expensive than the UK and served poor quality, badly cooked food.
Take into account all feedback you get and make an assumption based on that.