I work with about nine Filipino teachers. I'm one of only three native- English speakers left at my school. The school I work for only employ those with degrees or post grads in subjects related to education (for WP reasons), which is probably why we have so many Filipinos. not many natives with B.Eds or PGCEs/M.Eds would work here.
I only work here due to practical reasons at the moment (location due to wife's job), but we're off (probably back to the UK) when this contract ends.
On the whole, Filipinos are lovely people. Quite religious in many ways and always polite and helpful. However, they do speak their own language most of the time in the staff-room. Nothing wrong with that, but I've heard arguments saying that Filipinos who teach English abroad only speak English when at school. That is complete nonsense. They also speak a lot of Thai to their students too. I know of one 'English' teacher at my school who speaks Thai about 90% of the time to her pupils.
We make exams for each other (the school will not allow a teacher to make his own tests) and I don't get to see them until the exam day. Exams get 'passed' before the exam date by a Filipino boss. The last lot I got back were full of grammatical errors. To the point where I had to give the pupils a mark as the questions made no sense (sometimes more than one answer could be correct or the question made no sense at all). Of course, English is not their first language, so to expect them to get it 'right' all of the time is wrong. Even native-speakers make errors, of course. However, my experience is that they make a lot of errors.
They are also their own worst enemy (in my experience, which is fairly narrow if i'm being honest). The Filipinos at my school are overly obedient and never question management. To the point that they end up working evenings and weekends for free. The Thai management see this and now expect the same from westerners. Obviously, this is harder to implement. Not due to 'white privilege' or other such nonsense, but due to coming from cultures where employees have rights and will, if pushed, make their feelings known and move on to a different employer. We may be 'in Rome', but we won't be taken advantage of as easily.
This is why you will see more and more Filipinos and an ever decreasing number of native speakers of English in Thailand. China is now offering twice the salary and many of those jobs also offer free accommodation. The Thais either cannot (or will not) compete with this. Thai management love the bowing and scraping. In their eyes, Westerners are not very good at this and some are not afraid to 'answer back'. I've never seen a Filipino question a management decision. I've seen one agree to working three Saturdays in a row for free! They asked me too, and you can guess my response.
This has now caused me a few issues and I'm seen as a 'trouble maker' for refusing to work for free on Saturdays and Sundays, which is not part of contract. If, like me, the Filipinos stood up for themselves then perhaps I wouldn't be seen as 'the odd one out'. Of course, they whine constantly in the staff room about being taken advantage of, but never say or do anything to stop it! They had the chance when I spoke up, but they just put their heads down.
As I, said, I think they're all lovely hard-working people, but I just wish they would stand up for themselves a little more, because the Thais and at times, western agents, can (and do) take advantage of their good nature.