For what they were, it was fun, however they could have gotten a lot more creative with them.
Each trial should have corresponded to what Link was trying to obtain. For Farore, he was trying to increase his courage, so the Silent Realm is perfect for that. For Nayru, he needs to obtain more wisdom, and for that, there should've been some super complicated puzzle. Lastly for Din, some Darknuts would have sufficed for having Link's power grow.