Thanks for all the replies thusfar. Sounds like typical viewpoints of most of the carriers out there - some people enjoy them and some hate them. Clearly where you come from prior to GB can make a difference - if you come from a really bad situation then anything looks great...
From my perspective, if you compare GB to Easy then GB's schedules are an improvement based on all of the negativity around the consecutive earlies. I hear very few positives related to Easy in general.... If you compare GB to BMED, GB's night flying seems quite tame because BMED flies a lot of night flights. If you compare GB to the IT carriers, GB at least provides a relatively set schedule vs. non-existent schedules at the IT carriers (especially during the summer).
There seem to be no airlines with "ideal" working conditions - besides maybe the Beach Fleet at VS (744). BA pilots work very hard (especially on short haul), IT carriers seem to be slave drivers too. So, I suppose you should take the good with the bad when considering different opportunities and never expect a perfect situation - just try to find an opportunity the fits your interests and is not too objectionable...
Look forward to more opinions on GB and appreciate the insight already provided.