The pacing of 2 was bad and flyboy West was probably the worst character ever introduced in the series, and it didn't help that he actor playing him couldn't act.
Still they introduced some great characters, like Adam Monroe and Elle.
Volume 3 tossed consistent characterization to the winds and killed off anyone interesting from Volume 2 (Adam and Elle). They would also introduce an interesting story idea and immediately resolve it (or forget about it) by the end of the episode. They didn't let anything play out; it was constantly shifting gears and had no clear direction.
Volume 4 is a nearly complete 180 from Volume 3. They've picked one storyline and they're pretty much sticking to it, which is nice because you don't have to constantly re-adjust to characters deciding they want to be good guys this week instead of bad guys like they were last week. The character development actually makes a little more sense this time around. Plus it has Zircon music, so how can you go wrong?
And yes, it's mostly due to Bryan Fuller returning to the show as a consultant/writer (he wrote last week's Cold Snap, which was just amazing). It's almost worth losing Pushing Daisies for. Almost.
yes i'm still bitter at you ABC