So I like IG-88, but I've been trying to justify putting him on the board... ever... over two squads of troopers and I can't. He is far less health, far far less damage, less activations, more susceptible to stun/blood/weaken. For having to spend a fairly priceless 3 influence to even get him in the first place him being WAY worse than 2 squads of troopers is ridiculous. He should never see play unless the Imperial player mocking the Rebels at how much they suck because he is effectively a massive handicap. The only POSSIBLE way to get your points out of this guy is if you ALSO have Sorin and he is beside him using him as a sock puppet.
He needs to be errated to significantly less points for campaign, or have some benefit like give an influence point if he survives or something because, wow, he's just stupid as he stands.
Dengar at 7 points is over pointed as you may as well take an elite officer for 5 instead, but 7 points isn't nearly as terrible as IG-88's ridiculous 12 with no stun. 7 or 8 points really seems to be the break point here, anything more that just goes off into stupid territory.
15 points for the Champion? LOL, yeah right, that is AT LEAST 3 rounds of saving up threat which means 2 rounds where units could have been tossing out damage or stuns and slowing down the Rebels, it is so completely impossible for this guy to be worth his points it's ridiculous. Maybe his points work okay in skirmish, but if you're playing campaign, don't bother buying him, he's a joke.
Similar bad things can be said for high point figures on the Rebel side with Chewbacca and Han Solo. Wow, putting one of these guys on the field gives the Imperial player so much extra threat it isn't funny. Again, 2 more storm trooper squads, which... will shoot either of these guys dead in one round leaving the Imperials with.. two free storm trooper squads, thank you very much! They either need to be way less points or again give some significant bonus if they stay alive like extra credits or something. It's impossible to pull their weight at the points they cost.
Again, cheaper units like Leia can occasionally be a tactical choice, and Rebel Troopers or Echo Base Troopers can often be a good choice, but the high price uniques? NEVER.