Original Avengers include Hank Pym as Ant-Man before he went all GI, the Wasp, Hulk, Iron Man and Thor against Dr. Manhatten who, baring Tachyons already knows the outcome and will act accordingly. Ozymandius is the smartest termite on our nest but Tony has lots of lead time on out-weaponizing him. Silk Spectre II needs a gal-pal like Janet Van Dyne to help remove tacky from her wardrobe. Girl Fight! Wasp had a compressed air gun early on. Rorscharh has no axe to grind against a group of do-gooders. Nite-Owl II could probably match weaponry with Iron man for a bit.
You confuse what Dr. manhatten could do with what he knows he is going to do. Innocents die while he stands by, he is NO Superman-style do gooder. Of course Iron Man's helmet has automaticly closing eye protection. Can you imagine the effect of bugs on Tony while the armor is going Mach 4 or so?
Thor verses Dr. Manhatten. We pit the Hammer ULU and its ability to absorb energy against an individual who is in effect static energy. Remember that Dr. M style teleportation can be fatal unless Dr. M makes the decision to bring you through alive.
My advice, ask Dr. Manhatten how it ends and surrender if you need to. Hulk could clap his hands and take out the non-Manhattenites of the Watchmen. Hulk and Thor backed by Iron Man with a ticked off Dr. manhatten shouting "What have you done to Laurie" and blinking off random parts of your anatomy. Shrink small Hank and Jan and hope that sub-atomic works for you.
Tie all dead or gone in a minute and a huff.