She did consider herself a burden in the context that she loved MC but couldn't give him a normal relationship and, obviously, physical affection (sex included).
The dependency was an ingredient, but only because she thought that by standing alone, she would be able to overcome her issues and go back to him and give him what he craved.
She could have come back as a drug/alcohol addict without all the debauchery, but then she met Mia, that decided to "push her boundaries" (read: pimp her out to try and help herself under the guise of helping her).
As it is stated in the material, at least at the beginning, she tried to do the sex stuff just to overcome her problems and come back to MC and being able to have sex with him, remember, when she had sex the first time she thought she was cured and she could go back to him.
The objective was always to go back to him, but every step she took (and help from her "friend"), pushed her away from her target to the point of desperation.
You are correct, Isaac happened at her lowest point, but she discovered the "red bra", which gave her hope.
But the part many people miss is that her going to the deep end was an attempt from Lacey to
destroy her old and weak self, the one that couldn't survive alone, the one that needed alcohol and drugs, the one that saw her father in any attempt of intimacy.
It was a process of self destruction to try a rebirth, it failed.
In my opinion the "going back to MC" took a step back during the latter periods, and the self destruction took a priority over everything, even if the two are intertwined.
You are also correct in her inability of making good choices and her selfishness, she has always been narcissistic with him, but she recognizes it even towards the end in act 1 (Lacey redemption arc starts there).
You do know that there are people that can offer critic even towards Lotr and other established masterpieces?
If the criticism present in this board was akin to "this sucks, the story sucks, the character sucks and it should have never been made" I would agree with you 100%.
But, while that is present, in most cases the criticism is well thought out and is given as feedback or for meaningful discussion.
Maviarab made a good point, imagine being an author and wanting a character to be percieved as calm and collected but all the audience percieve it as hot headed and all over the place, wouldn't that give you an indication that maybe some of the choices that looked good might not be so good after review?
And I don't even want to bring the coding or story continuity mistakes into it because it is a perfectly normal thing that can happen, but character perception is kinda important to the story that is being told.
Hell, I always find it funny to see comments like these, when some of us went out of our way to "protect" the author work in different platforms when he was being criticized unfairly.
I agree with you but I often praised the author also for the good things that he does.
I will do so now, he was able to bring an amazingly interesting story to life, pushing boundaries and bringing emotions alive, he made a very hard game to make, touching some subjects with more sublety than he is given credit for.
His control of the emotions being portrayed is great, and will lull the player along to the point where many other things fade into the background, unless you have a deviated mind like me and even I missed something like the "laugh" on my first run of act 2 because I was engrossed in the moment, which is a VERY rare occurrence.
In the entirety of act 1, the player is kept guessing, most of the stuff that happens is not what someone would expect, the tension is high and the resolutions often leave dark spots that are hard to resolve.
Even in some scenes that on closer inspection have some flaws, the emotional shock that has been created is so big that you can't look away.
I could go on talking about Lacey arc, which was build step by step, sure the steps might have been too close to each other for some, but you can see Lacey 2 shining through during act 1 too, she is my favourite character for a reason.
And if you read closely you can also understand her desperate attempts to change the situation, ok the brain damage is abused a bit as a tool, but you can perceive her goals and state of mind more than anyone else.
Anyway, I agree with 99% of what Dios said, the betrayal part is masterful and I don't even like betrayals.