Figures are really great for Deathwatch.
The idea that a game about Space Marines has to be all fighting all the time is ridiculous. It doesn't, any more than a game about adventurers has to be all dungeons all the dragon.
Space Marines go on quests, pilgrimages, exploratory expeditions and so on. The Bloodquest comic should be required reading for Deathwatch DMs. Yeah, it's a lot of fighting, but it's not the typical "five minutes to drop" Spehss Muhreen story.
Space Marines see and do some crazy shit in their lifetimes. And seeing and doing crazy shit is what the Inquisition does too. Inquisition Space Marines are going to end up in the least probable situations the galaxy has to offer.
How about a Deathwatch game where the players have to remove a Jokaero pack from a hive city?
If they just attack, they have enraged, protective techno-monkeys rampaging around with an unlimited supply of raw material. You can't win that. Jokaero can build a vortex grenade out of some metal scraps as easily a you or I can take a piss. I mean, what do you DO in that situation?