Seething unfriendly?
I think not.
They may have internal politics, but ultimately it's a members airfield operated by a committee appointed by the members.
Said committee runs the airfield in the best interests of everyone, does all the work and gets all the flack.
Personally, I reckon Seething offers value for money in terms of a well run and relaxed environment.
That said, if you can afford to operate from Norwich Airport (and their are plenty of operators with hangerage) you are more than welcome!