I definitely agree that you should not make your mission easier. I thought the ground combat was too easy, personally. Even a group of several medics is not a serious challenge, if you know what you're doing. The Ensign and Lieutenant medics can be one-shot with a sniper rifle exploit on Elite (or nearly so if you're not a tac), so they are not that hard to take down. If a medic is being problematic, then just going into melee range and repeatedly using knock down will interrupt a lot of their heals and generate enough exposes to take them down.
I'd really like to know what I'm doing wrong then! I always set up exploits, often with the Breen gun and a sniper rifle, and target single enemies with the whole squad, try to get in a couple of grenades from a boff or two, but still find that I get medics down to like 5% and then have them heal up completely in one or two actions.