It almost never pays to
DS Assault Terminators of any variety.
I must disagree with EzeKK on this point about shooty Terminators, however. There are times when this is a viable option, but rarely when it is best. If you use a Heavy Flamer, you might want to
DS that unit for the chance to get close to roast some cover-loving grots or pathfinders when walking all the way to them is just not an option.
Seeing as you are playing
DA, I'd suggest taking any piece of gear that negates
DS Scatter, or course. Sneaking up a bike and having to play conservative for a turn or two can pay off if you can guarantee your kill shot when you get there.
If you don't have anything to reduce or eliminate scatter, you're going to have to take a close look at the terrain and deployment to figure out your best option. Try to leave yourself the most forgiving deployment in case of scatter, such as all the way on a flank, or in a covered position. Never put your starting point within 12" of an edge. Actually, 14", for safety, depending on how many you have in the unit, you may still loose a couple if you end up on the edge and have to make a ring around the leader.
Basically,
DS is a bad option for Terminators, because they have only a slightly higher than normal resilience to shooting, and no safety gear for DSing, like the Drop Pod's special rule. For Vanilla marines, using the Locator Beacons on a Drop Pod to bring in your Termies as part of the forward strike group is perfectly feasable, if you don't mind loosing a turn or two of shooting.
Personally, I use the new
CML's, so with their range, I use them while walking forward across the table, and I don't want to loose those vital first rounds of shooting. However, I have had the occation to be sneaky and join them with a Termie Librarian to use Gate of Infinity to take a 24" jump to my Dreadnought's drop pod over in enemy territory.
"Oh, I'm sorry, are those my elites all up in your grill? Pardon me for saying so, old chap, but kindly stuff it."
Chaos likes to
DS terminators because they're cheaper and can come with Combi-Meltas, and it's not like they value their troops, anyway. =)
As Marines, just remember, if you scatter a whole squad off the table, that's between 2000 and 6000 years of combined experience in soldiers and wargear you just tossed into the warp!
As a sidenote, this paradigm may shift with Planetstrike, with units that can
DS (like Assault Terminators) being able to assault in the drop turn. If that's the case, when I start playing
PS games, I'm gonna load up on Pods with beacons, and have a second wave of Hammernators that pull off a drop-turn assault for MASSIVE wins.