gundamgoth - I find the best results if you accept that an OW Templar is going to be dedicated to defensive moves. Especially with early Talent points, focus is good. Don't go for BF 2 and OW 2, go for OW 3 and 4. Of course, you're using Strength and Gunnery weapons, so invest in those. However, a lot of shooting on OW is going to wrack up big heat, so split your Attributes between Fortitude / Willpower / Strength. Strength is kind of last because for a while, Gunnery can take care of it. Watch your OW successes, and decide what gear you need. Are you getting enough "p" (penetrating hits) or do you just need more damage? Are you paired with a scout who is reducing armor, and so more damage is going to have a bigger impact then "p" on smaller armor values?
All Soldier's start with a Calling Shots buff. Do not make the mistake of ignoring this awesome buff. For most Soldiers, I use this as a self-buff and hitting other nearby Templars is convenience only. Things are usually moving fast enough that I don't want to spend time clumping Templars if I don't need it. With the average deploy between 12 and 20 turns, you can stay ~80% Buffed on your Accuracy without raising the Talent at all, which is critical not to miss this.
Long Leviathans are especially great for OW, as they give you a lot more sweeping room.
So far my favorite talent to max out is Burst Fire. I do put one point into the grenades as soon as I can. Once BF is done, I'm focusing on talents like RC and CS. With two soldiers together, one can BF most xenos away and the second goes into OW to handle the rest. I haven't raised OW at all.