The pen requires a bit more pressure than the Wacom tech from SP2. Whether it's just because of the different technology, the differences in levels of pressure sensitivity, I don't know - I adapted after a couple of days and personally I like it.
I think the writing experience is quite personal and if you don't like it, that's just how it is.
It actually probably needs less pressure, not more. The SP2 gives handwriting that looks like natural handwriting. I find looking at what I have written there is less variation. One person commented to me that it is more like using a texter writing on the SP3.
There is also the palm rejection which is built into the screen in the SP2, not the pen. At least it feels that way as it always works.
Then there are the times there are bluetooth issues which aren't there most of the time but I am finding times now when it does happen and refuses to write or misbehaves.