I have no prob with v4 other than i like the old style long length full referral urls that v3 gives. If there are 300 ref urls one day, you should see all 300 like v3.
v4 makes breaking down by cmpn very nice and also the submit/approval data is only avail in v4.
So we need a best of both worlds.
v3 is a pleasure (and necessity for some people with the better, longer url referrals) to use.