How to judge BB height visually and the effect on handling? Is it possible by viewing a bike frame to tell roughly what the handling of the bike is going to be? This current question is about bottom bracket height in the above mentioned respect.

I have noticed that some bikes have parallel to ground chainstay, while others have angled. Assuming 26" wheels, is this angle enough to judge BB height, e.g. "low", "medium","high". If so, are those categories enough to provide some concrete information about the handling of the bike (e.h. "a lot of clearance", "aggressive turning"), considering constant wheelbase and constant headtube angle?
BB height is something that is very important in mountain biking, as well as other disciplines. It effects where the riders center of gravity is in relation to the bike and to the ground. Generally speaking, a higher BB height will lead to a higher center of gravity making the bike harder to turn when the rider leans into the turn. A higher BB can help you clear obstacles though, especially when you consider how far down a big ring may hang from the BB.

Judging BB height visually is something you'll have to learn from experience or by putting a couple bikes next to each other. How good are you at judging a 5mm difference? If you can't then judging BB height is pretty much useless unless you're comparing a hybrid touring bike to a full downhill bike.

Another important point is that not all chainstays will be straight. What about full suspension bikes? Some of those chainstays arc up and not tell you anything about BB height. Suspension also means that as you put weight and/or pressure on the bike the BB height will lower as the suspension moves through it's travel.