Do SMART values have any sense at all?

Is it possible to understand SMART values somehow?

Here is an example of values shown for one of my drives:

Following questions arise:

1. If Reallocated Sectors Count is 2 and threshold is 36, then why is marked with red? Threshold is not exceeded yet!


2. What is FB3? From hex it is 4019, i.e. neither 36 nor 2. Where it took the values then?


3. Current Pending Sector Count is 100 and threshold is 0. Threshold is exceeded. Why is it marked with yellow then, not red?


4. Why are there so much 100 values? Looks like it is stub value. How it can know status then, if the value is stubbed?


5. What is B? From hex it is 11. Neither 0, nor 100. Where it too value then?

So, the only understandable value is the color of knob at left, while all other values are filled with delirium. Is it possible to understand here something?

Note that by some reason, this delirium is repeated from one SMART application to another.