They have cut down on good benefits, but so far i like flying with airberlin for several reasons.
the planes seem nice and fresh and you always have a good chance of a place being free next to you as they totally enforce a "leave the middle seat free until nothing else goes"
they are bad though with having your miles listed, i had to call several times.
they offer better miles than some other carriers and have decent priced flights, especially one way.
so not so much for the ffp but for the actual service.