From Redditor u/Anasazi_Fozzy:
The Valar and Maiar are absolutely useless and the cause of most of Middle-earth's problems. Their actions directly lead to Melkor ruling and corrupting Middle-earth, and they basically do jack sh*t to handle it unless they can get off their lazy a**es. Maybe Ulmo is alright among them because he actually tries to help, but yeah. Also Aule is the worst; not one but two of his disciples (Sauron and Saruman) completely lost the script, and he went and created dwarves outside of Eru's plan, which caused their own amount of grief.
The Maiar that we know are pretty shitty. Like most of them are Balrogs or Sauron, and the five wizards of the third age are mostly useless or an active detriment. The only useful one was Gandalf, and even he took literal centuries to get his sh*t together, and Frodo would have been toast if he had waited for Gandalf as planned in Fellowship.
Before anyone tries to say it, yes I get that their actions/inactions are crucial to the story and world building, and I don't slight the actual writing and story telling skills of Tolkien. After all if they had not made the actions they did, then we would not have the excellent story we have. Not very fun to read a book that is 5 pages about how all powerful Gods beat the shit out of Melkor as soon as he turned evil and everything was fine. I'm just saying with-in universe it's pretty obvious that the angelic beings don't really have a lock on anything, or a huge stake in the outcome of Middle-earth.