Um...
Have the scout weapons been buffed or something, mainly the Bodyshot damage.... I was healing a Heavy and one scout shot through the heals BY HIMSELF as he ran around the heavy. That and has Medics healing speed been decreased, I have the "Numbers on damage/heal" showing and the speed that I was healing that medic was so slow it wasn't funny...
Fact time!
The scout's scattergun is somewhat similar to the shotgun, except that it has boosted rampup, that is, it can do a lotta damage at close range if you hit really well. It'll do about 108 damage per shot with a perfect meatshot, enough to twoshot most enemies. The aiming, of course, is the real issue here.
For the medic's healing thing, the rate of healing depends on how long it's been since the target was last injured. If he's just been hurt, it'll be around 24 hp/s, and it increases from that up to something like 72 hp/s, if I recall correctly. This is to prevent heavymedics from being too overpoweringly powerful, while still making going to the medic a better option than suicide and respawning. The medic's self-heal works in a similar way, increasing in strength as the medic goes on without being hit. This is an old feature, by the way, but it isn't very obvious if you don't know about it.
Fact time over.