I enjoy summoner. it is essentially about managing three different areas:
1) your aetherflow stacks to get you to dreadwyrm trance
2) your dreadwyrm trance which builds up stacks allowing you to summon demi-bahamut
3) your pet management allowing you to maximise the use of rouse when demi-bahamut isn't up.

it sounds harder than it is, and I quite like it.

(inb4 someone tells me i'm doing it completely wrong. :P )