Well, Doom's magic would be useful against the Kryptonians, but not so much against Diana, and even less effective against the Marvels. His magic/tech is good enough to stand up against high heralds for a time, though. Magneto's versatile and powerful in his own right, but I'm uncertain of how he'll fare in this fight as a whole. Nova's TP is pretty tough, but I think Diana will probably resist it or be immune to it. I know telepathy has been shown to be dependent on plot as to how far it effects the Marvel Family members. Their wisdom and courage usually protects them from mental intrusion/attack, but I know Captain Marvel was once forced into saying Shazam by Brainwave (though Mr. Mind was inside of his brain, so he could have been amped or something). At the same time, he was apparently only mildly irritated when faced with a room full of telepaths the Ultra-Humanite w/Thunderbolt had been using to keep the majority of the world docile. And Black Adam has been shown to be effected by Psycho Pirate, so take it as you will.
In character, I think Doom and the others pack more versatility and the willingness to use it, but can they win before arguably the strongest and fastest tough guys (and gals) in DC destroy them?
Can Doom activate Castle Doom's defenses/use it's resources during the battle?
Castle Doom's defenses are initially all dormant, and the only tech or resources available will be those that can be proven to be regular elements of the castle (Doombots, I imagine. I wouldn't know what else).
If those can be accessed in the middle of battle, they're free to be used.
Cassie, Mags and Doom will all be shielded by both Magneto and Doom's shields.
As far as castle defenses go, I'm hoping they don't become a decisive element of the battle. Feel free to state whether they'd be matchbreaking or not.
these three are low heralds? well, I think they win.
mindrape the ones that are more vulnerable to TP and sic them on the others, CM and SG I believe. Rain magic on the kryptonians.
activate the doombots and defenses of the palace, Mags and Doom would do this instantly.
exotic energy attacks on their metabolisms, massive blasting, controlling WW's tiara and BFRing tactics can do the rest.
All of them move faster than the speed of thought.
If Latveria is empty, each of them individually are capable of flattening it.
All of the DC crew can hit with the force of nuclear bombs. All attacking at once is a recipe for pandemonium. As long as they are not trying to restrain Black Adam and tehy all are fighting to get at the three villains, they can win.
IMO Cass is going to from the gecko mind control a couple of the strongest ones on the other side.
Doom will activate defenses and send all doombots againt team2. I don't expect them to be a serious threat but after Doom Wars Doom should have lots of toys around that are dangerous.
Magneto can basically just focus on forcefields protecting the team and castle if needed.
Once Diana gets a lasso on a TP controlled person, they're free as well, and lassoing Nova also prevents her from using telepathy.
The Marvel enchantment's original purpose is fighting mages, so they're at least as well off against Doom's spells as Diana is, maybe more-so. They're fairly hard to mind control too.
Magneto stands a good chance at occupying or KO'ing Diana, and I'm sure he can handle her while being a nuisance for the others.
Cassandra and Doom are capable of double teaming the Kryptonians by keeping them either physically or mentally completely occupied, then using magic or telepathy to take them out.