Emotional baggage

We all have some to varying degrees.. How do you deal with somebody who has a lot of it? You were forewarned mind you. But the point still exists that the person has a lot of emotional baggage and it transcends to the current relationship. Do you tell yourself to be sensitive about it? Or do you debate about how unfair it is to you that you have to put up with additional complications..
Life's complicated and relationships are even more so but add some emotional baggage to that and you have got quite a handful to things to deal with. How much of a baggage is really acceptable also?
Is there like a permissible limit before you are declared to be too messed up in your head to be dealth with ? Thats a tough call to make. How do you really guage how much a person is bringing to the table in case of a new relationship. They may not even be apparent for all you know.. But its there somewhere at the back.. touching everything a person does or thinks ever so lightly..
It will be evident as days go by, little things that will be touchy, a little cynicism even. Topics that will be avoided like plague, people not spoken to, things not done, not acceptable, thought not seemingly making sense.. the list is endless.
There is really a simple and straightforward reasoning behind it (or is it even that straightforward?), emotional baggage, too much of it at that.

Is this the same person you thought was so perfect for you? What made you think that ? Did you really think you could deal with all thats going on in that small head? Did you even know what was going inside that small head ??