Tino, what do you think was the miracle in each book? What do you think was the betrayal in Final Empire? Unless you're talking about how Marsh betrayed the other inquisitors? No surprise at all, since he was a spy in the first place.
A miracle isn't a miracle if everything fits with the way everything has been explained to work in the world. The idea of deus ex machina is that that god comes out of nowhere and makes everything OK.
Elantris: I don't see any miracle. Unless you mean Raoden's drawing of the line? Foreshadowed. Or Hrathen's having a dahkor arm? Foreshadowed.
Final Empire: Maybe the drawing upon the mists was the miracle you're talking about? Yeah, that kind of came out of left field. In the original draft of the book it didn't happen; Vin just grabbed off the Lord Ruler's bracelets after she figured out they were feruchemical, and he aged rapidly and she killed him. Now, there
is a reason for the 'drawing on the mists" thing, but it's not revealed until book 3. If you like, you can pretend it didn't happen in book 1.
Well of Ascension miracle: Are you talking about Elend getting healed and becoming a mistborn? That there was some way the mistborn were originally created was foreshadowed. Or are you talking about Vin figuring out how to control the koloss? Also foreshadowed.
Warbreaker: Miracles are built into the book from the start, so they're not a deus ex machina.
Betrayal is a tried and true part of fiction. Brandon specifically wrote Final Empire to
not include any betrayal, even though it was built up from the start that Vin thought betrayal was inevitable. Also, in Well of Ascension TenSoon was the spy, but he didn't really hurt Vin and immediately turned to her side anyway (this was betraying his true master, of course, but...so?) As for the betrayal shattering the plan with no hope of winning, this only holds in Elantris and Warbreaker. In Well of Ascension they had no hope of winning the whole time and the betrayal didn't affect that. In Final Empire there was no betrayal, but the supposedly-shattering event of Kelsier's death was actually his plan to pull off victory and it worked.
Your "known antagonist" thing doesn't really hold true for Warbreaker unless you count the whole country's government as the known antagonist at the beginning, and they're only really the antagonist for Vivenna's story. In Elantris you could say Hrathen is the antagonist, but he's more the protagonist of his own story, and he has nothing to do with the underlying conflict from the prologue (why did the magic disappear?). In Well of Ascension, Straff and his army are the antagonists to arrive first on the scene, but it doesn't take long before multiple other antagonists chip in. Your statement only really holds true for Final Empire.
The "protagonist is ripped" plot; how does this apply to Well of Ascension? Elend has to learn political powers? Characters have to learn things in most stories out there.
I think the books are different enough from each other in both fundamentals and execution to all be entertaining.