Phoebe was WAY weirder at the start of the series than at any other point.
I disagree she was weird yes but not too weird. Then later on we got things like the rat-babies. The whole crap when Chandler was buying his ring and she was in the little jail. The past life crap during the thanksgiving episode.
At the start her weirdness was more environmental from upbringing ect.. and had a naive and innocent quality to her. One the show started to go down hill it became more weird but also more forced like she was trying to be weird.
A great example of this is season 3 she plays with her doll-house and is very childlike in her way. That seems logical as she had no real childhood. Never thought I'd use this in a good way but, Look at michael jackson as an example. His child hood was horrible and then when he grew up he was said to be childlike at times.
Then we move on to near the end and something that is meant to be important to her, her marriage she goes down the office and changes her name to what? Princess Consuela Bananahammock! It seemed so weird and stupid that it was like she was going out of her way to be weird.
So to compare early seasons Phoebe = a little weird but understandably so. But a good hearted innocent woman.
Later seasons = Much more weird and not understandable. More of a selfish attention seeking ***** (I say ***** as later on the way she treated her friends was shocking)
It's almost like two separate characters. One is very likeable the other not likeable at all.