Andrew- quit while you're ahead!
One of the problems we face is nothing to do with the website.
NOTAM are originated by all sorts of people. AIS are just the publishers. If DETR or an aerodrome operator or the police or military issue a NOTAM AIS have to promulgate it. The
Manual of Air Traffic Services Part 1 lays down what should and should not constitute a NOTAM, however this is sometimes ignored. Because NOTAM are required reading it can be seen as a convenient way to get the message across.
Also some facility owners tend to NOTAM everything on the grounds that they can't be wrong if they put it in. This can be detrimental to safety by obscuring the info that IS relevant.
Have a look at
this thread for some amusement on this subject.
What we PPL's refer to loosely as NOTAM are not in fact NOTAM, they are pre-flight information bulletins (PIB's) containing information selected from the NOTAM database. The criteria we enter on the pages of the AIS web-site are used in the selection process. If we are loose with our selection criteria we will get more data returned. If the originators of the NOTAM in the underlying database coded them wrongly we will get irrelevant data.
The old computer problem GIGO, Garbage In - Garbage Out
Mike