I went to Palawan earlier this year, easily the best food I've had in the Philippines. Fresh grilled seafood, and the vegetables I had seemed good quality. But I think it's the exception that proves the rule.
That said, easily the worst food I've had in Asia, by a long way, is in Myanmar. The thing I dislike about a lot of Filipino food is that it's fried, but there's some that isn't. In Myanmar, I couldn't find any local food that wasn't fried, and fried in poor quality and old oil. Again, to your point, it's a lot to do with poverty I think.