Difficulty is very high. It's hard to get a share in with 1.5TH/s. It took me 12 hours to get one share with 1.1 TH/s.
Remember the 3 days PPLNS. Your payout dropped because some of your shares from 3+ days ago have fallen off.
M
in other words at this time isn't profittable mining in p2p with <1.5 TH / s?
E
It should be just as profitable over the long run, but you will see wild swings in your payout amounts and frequency as the diff adjusts as well as the pool grows.