i cant tell you exactly what he would be thinking but seeing how he now s of sups he'ld would have cooked up a way to steal his powers for one set up a trap to capture him or set something up to distract him from defending the fortress, banish him to another demnetion, depower him, swap bodies with him, so on and so forth
First off, Doom's used the Crimson Bands of Cyttorak in a comic before. He learned it from Dr. Strange. No way Superman could break out of those. Seeing how his strength is useless against them, Doom would immediately discover his susceptibility to magic. He'd then proceed to burn him to ashes with magic hellfire ftw. Or he'd enchant his gauntlets and beat him to death. Whatever.
Second, his Doombots would only be used to analyze the extent of Superman's power and therein lies his victory. Because Doom would very easily see that he could not match Superman with raw power. He'd resort to magic, not technology.
Superman's only win could happen if Doom let his pride get in the way and tried to man up on Superman without using his weakness to magic. Certainly possible. But I haven't seen Doom not press an advantage or sneaky underhanded trick ever. He never manned up against Thing, Surfer, Beyonder or anybody. If he saw a weakness he seized it. Then again, his pride has always been his downfall and I'm sure Superman could eke out at least one win.
all of those plans have probability appealing to them.
in a neutral situation, they still cannot stop superman's speed, his t-vo, and the fortress's defenses.
still wont stop doom from succeeding even if it's only a temp win and sups make some kind of comback the odds are in doom's favor that he's going to posses the fortress for atleast an hour or so
Doom's army would probably have a Doom-look-a-like in it's midst.
People keep saying how smart supes is, but I can easily see him falling for this. If Doom has been able to outsmart the Beyonder, Mephisto and Reed Richards, he can outsmart Superman.
While Supes is dealing with, or even trying to reason with fake-Doom and his army, Doom somehow finds a way to get to the Fortress, or take control of Supes, shunt him into another dimension, use his own powers against him, bring a character that Supes has had troublebeating, etc, etc.
If it can be done, Doom would do it. That is the difference between the "Doom-Type" of character, and the more one dimensional types.
Where AbsorbingMan, for instance, will just use his absorbing powers, Doom will use a wide variety. Anything to win. Not just his armor, or magic.
Not totally unexpected. But what does that have to do with Superman? Namor's super-strength isn't negated by magic. You trap Superman in magic bonds and his strength won't break them. Same way as his super-durability won't save him from a simple enchanted knife.
BTW, when did Namor break out of the Crimson Bands of Cyttorak? That's a mean feat. I remember Dr. Strange saying they were unbreakable as long as they were properly enchanted. BTW, was that the spell Dr. Strange used on Namor in 'New Avengers: Illuminati' or something else? Looked crimson to me and looked like it was binding Namor.
Dr. Doom would never send himself among the Doombots. He always sends his Doombots first. Hell, nearly all of the FF's initial fights with Dr. Doom were with Doombots and Dr. Doom was never really there in the first place. Like I said, Doombots would be used only to gauge Superman's powers or as a distraction. That's how Doom always uses his Doombots.
I thought they only got basic knowledge. Didn't the OP say that Dr. Doom would generally know Superman's abilities, but not his weaknesses like magic, red sunlight and kryptonite? If Superman gets to know about Doom's Doombot tactic, then its only fair that Dr. Doom knows about Superman's weaknesses, and then... pfft... game over, Doom ten times out ten completely.
And here I thought I might have overestimated the Crimson Bands of Cyttorak. Nice to know that I didn't.
Errr. My reply to that would be that if Superman knows that Doom knows his weaknesses and adjusts, than Doom would know that Superman knows that Doom knows his weaknesses and would counter-adjust...
Oh crap, but then Supes would know that Doom would know that Supes would know that Doom would know of Supes' weaknesses and Supes would counter-counter-adjust!
Shite, but then certainly Doom would know that Supes would know that Doom would know that Supes would know that Doom would know of Supes' weaknesses and Doom would then just counter-counter-counter-adjust...
Long story short, I'm pretty sure that OP said they only got basic knowledge, which didn't include weaknesses. Hence, the above babble is meaningless.