Wow, and you used to hate Morbid Angel. Nice job coming around.
If you're really becoming a fanboy, yes they are all worth it, but to be completely honest the only one with any real lasting appeal is Formulas Fatal to the Flesh. I think calling it thorough is the only proper description. It has a very unique production that takes some time getting used to, but once you really get involved it's a great album. I disliked it for years.
Oh yeah and Entangled in Chaos is MANDATORY if you enjoy any one of the first four. One of the best live albums ever.