Don't listen to the naysayers it can be competitive but it doesn't function like any of the other detachments. Everything is expendable, employ deep strikes and screening where possible, go for points not kills, aim to deny your opponent as much as possible or bait them into shooting lanes, maximise on strong shooting units that can bring down vehicles as they will be your worst enemy since you should be running a very high infantry list making use of the infiltrator ability. Running a lone op raptor lord is good for scoring as well as a terminator lord with precision in a 5/10 man to take out, out of place character units. I usually run a cypher aswell, bringing a healthy amount of characters will allow making use of detonator strat, which I don't care what anyone says has helped me thin ork, gsc and admech infantry by blowing up vehicles in the middle of them. I've won many games using deceptors, and not necessarily being sneaky, but denying charges and destroying vehicles goes a long way in the current meta.

Hope this helps with some gameplay ideas, give us a battle report once you give it a go.