IA vs PG: distinctly different games?

[Tony M]

If IA is as bad as some are saying, can anyone think of a reason for this?

May I assume the IA system is broadly based on PG? If so, PG has been around for a long time, and I would expect a system based on it to be at least playable. Dr B is not a newcomer to the wargame business. In private email exchanges with him, he strikes me as a very bright fellow who cares about his company's products.