How fucked would Earth be if the Marker was real and began its influence right now?

how many aliens?

Wouldn't one queen be enough to pop out a huge as fuck army of them?

She can lay eggs yeah, so if she can get a spot and get some hosts, then the aliens will be able to spread really easily.

mankind can effectively fight against xenos. there are tools to salvage this earth, even if it's gotta be scorched sun. Not so much The Marker's power and transformations. The animated films did pretty good in showing how brutal, fast, merciless, and out of control it'd quickly become. Just multiply that with hundreds of military bases and potential immediate local transformations, all of our weaponry would be pretty much junk. It would be so chaotic that the rule of thumb would be KoS any and all, and it'd become a constant culling brought about by collective psychotic madness and spontaneous mass societal and economic collapse. Xenos, mankind can still gather together, still rationalize things out with each other despite differences. That's not happening with The Marker.

you can't fuck the maker

Every planet has a marker. Rather, the planets that had life at some point. The markers are encoded with the genetic information of the species. When Aegis' marker was found and tampered with it malfunctioned and imprinted all dead organic tissue with the species info of Aegis'XII which was a race of gigantic worms.

Earth's marker would make people mutate into humans, which would not change anything. Of course all this was forgotten when they wrote DS3. Essentially what happened to the Aliens franchise.

Not really, no. In Aliens the queen was there for god knows how long and there were only afew several hundred eggs. So there is either a cap or there are factors in her egg production.

Another strong point Earth would be fine is how a squad of colonial marines did alright fighting a nest with no information on xenos, no sit rep, and restricted from actually using their guns half the time.

In Alien vs Predator, there was this Queen that was placed into bondage, frozen and then re-animated when the temple of trials was opened by the human expedition. During the film, it's explained that humans once worshiped Predators as Gods and were taught science and technology, and as such offered some of themselves up to the Predators to be harnessed and birth xenomorphs, the "perfect prey". One time, a sacrifice event went out of control, and the planet underwent a subsequent extinction event triggered by the Predators. This civilization collapsed and nearly everything about these records were lost in time yet humanity survived.

proofs, is pretty cool if tru but proofs

Pretty much this, the marker spreads actual memetic effects that fuck with every living thing, mass psychosis and paranoia will spread and run rampant, the deranged will build more markers, and the problem will quickly snowball out of control while undying abominations reanimate from the corpses in new and fun configurations