Kendra wasn't necessarily a bad guy right?

[F9zSlavik]

If I understood the game, she was going to take a man made marker somewhere else right? The government sent the Valor to Nuke the place, was that group part of Kendra's group or were they working on their own? I'm guessing the government knew about the place.
So Kendra wasn't necessarily a bad bad guy?
I mean what was the point of doing all that extra work to return the marker and place it back on the pedestal if the whole place was going to get hit by the giant core piece. Had Kendra taken the Marker, what do you guys think would of happen to the planet monster? Also, Kendra is making everyone out to be nuts whens he herself was seeing her brother. Bit of a story disconnect there as no one points that out. I'm guessing she would of gone insane just like Isaac did in dead space 2.

[THE VERY REVEREND MISTER BONK]

He was in it for the money. That's pretty bad all considered.

[EmCiih]

- Is Kendra bad?
How bad/evil Kendra is depends on your point of view. She kills (mostly) innocent people, though they were corrupted by the Marker. Though she clearly gives Cross and Isaac the chance to walk away.

Her mission was the retrieval of the Marker. (assisted by the Valor)
She is likely the Special Ops mentioned in the log found in the Valor's Briefing Room.

- Why return the Marker?
The Marker can't start Convergence because it's makers are gone.
That's why Kyne and Nicole get told to return the Marker to the pedestal.
Returning the Marker to the pedestal amplifes the "Dead Space" around it, thus rendering the Necromorphs and the Hive Mind harmless. This will allow an architect to be imprinted with the marker blue-prints. (Isaac or possibly later visitors to the planet)

Without Kendra's intervention Isaac could have possibly managed to stabilize the payload again.

- What if Kendra was successful?
If Kendra had successfully removed the Marker from the system it should have returned the Hive Mind and it's Necromorphs to goo, since the signal is required for them being being animated. (Seen in the movie Aftermath and referenced in Dead Space 2)

- Kendra being nuts
Kendra is the least nuts of them all, since she still remembers that her brother can't be there / is an illusion. Also she could have faked that, unlikely as it is.
Also also I do not see a point where Isaac would call her out on that. (and he's the only one who could)
She calls Kyne nuts, since he killed the captain and tends to his imaginary dead wife. At that point Isaac is still supportive of her "Don't let this place get to you"
Later she says there's no way back for Isaac since he
A: Went along with Kyne's insane plan
B: Had his own imaginary dead girlfriend

To your last point:
Yes, very likely she would have lost her grip on reality with further exposure to the Marker during and following her flight.

[shiv]

She wasn't bad. Ruthless, sure but given the situation, a moments indecision or hesitancy could and would doom the human race. Everyone so heavily tainted by the marker as the characters we meet -including Isaac - represent an unfixable, massive danger to mankind.

Playing as Isaac, I was happy she died.

But objectively it sucked because she was the only one capable and clear-headed enough to do what needed to be done, and she d
Was workibg for rightwous, grand scale reasons... she did it BECAUSE it needed to be done. Not for greed or to cover her own or someone elses ass, she did it because of the necessity, making her objectively not a bad or evil character.

[Nuka-Cola Zero]

Yes, she was bad overall. She was SpecOps. She was part of EarthGov's red marker research project. She was there to tie loose ends. The Valor had containment protocols in case they found survivors on the Ishimura which meant no witnesses. Kendra left Isaac to die on the Ishimura when she took the shuttle. The "you'll find another way out because you're hell of an engineer" line was just the devs trying to make her seem more sympathetic (which based on the comments in this thread was successful). She also killed innocent people.