In reply to KASP82:
There are so many compromises to make with jackets, along the lines of:
If it's fully waterproof it won't be breathable
If it's very light it won't be warm
If it's very windproof it might be heavy
I'd recommend reading Andy Kirkpatricks articles on outdoor clothing.
You begin to learn that you need different jackets for different situations, or have a really thick jacket that weighs a lot and is too warm for most uses.