Certainly the Neve preamps have a sound of their own.  As far as them not working well with newer mics, I don't find that to be true at all.  The slew rate is part of what makes the Neve preamps so fat sounding.  I do agree that unless you are looking for that specific sound, a Neve preamp may not be the wisest choice for a first preamp.  But, Neve preamps do what they do and do it better than just about anything out there.  There is most certainly a "magic" there that is very sought after.  In my opinion they are an excellent tool to have around, but they are also sort of a specialty item and I would reccomend a decent assortment of other pre's before going down the Neve path.