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I put some situations into an Omaha calculator, and found that sets have a huge advantage over even the best draws, so I'm hoping they have str8 and flush draws only.

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The "best" draws are str8 and flush draws at the same time. For example:

Player 1 has : J [img]/images/graemlins/spade.gif[/img] J [img]/images/graemlins/heart.gif[/img] 7 [img]/images/graemlins/club.gif[/img] 7 [img]/images/graemlins/spade.gif[/img]
Player 2 has : A [img]/images/graemlins/diamond.gif[/img] K [img]/images/graemlins/club.gif[/img] Q [img]/images/graemlins/diamond.gif[/img] 9 [img]/images/graemlins/club.gif[/img]

Board is : J [img]/images/graemlins/diamond.gif[/img] T [img]/images/graemlins/diamond.gif[/img] 2 [img]/images/graemlins/club.gif[/img]

Result
http://twodimes.net/h/?z=1301480

pokenum -o js jh 7c 7s - ad kc qd 9c -- td jd 2c
Omaha Hi: 820 enumerated boards containing 2c Jd Td
cards win %win lose %lose tie %tie EV
Js 7s 7c Jh 353 43.05 467 56.95 0 0.00 0.430
Kc 9c Ad Qd 467 56.95 353 43.05 0 0.00 0.570