Barad Guldur had difficult trash pulls that took time to work through which sort of took the place of bosses... at least regarding some time spent. Unless each of the 3 single-boss raids has intricate trash to get through, we're getting less content. I mean, really, think about the previous raids and all the encounters they had regarding trash and mini bosses.. and compare them to doing a Turtle, Watcher and Draigoch. It's just not the same really. We'll have to see what the storyline is like once we get them regarding any cohesive feeling.
I'd prefer no trash at all to BG-style trash, although the Gauntlet was fun as a Champ. I just don't want to run into TimeSink Lights again.
I'd far prefer boss fights with adds that must be dealt with, like Gortheron or Orthanc Shadow Challenge. In fact, a Gortheron-length lair boss wouldn't be that bad, although even with three such fights we'll be done with all three wings in an hour to an hour and a half (which is neither an inherently good nor bad thing).