How can you tell when a team must be pretty awful in Team Fortress 2?

When I'm topping the scoreboard as a Soldier.

Or then I'm really not that bad a Soldier. And our team couldn't have been that bad since we weren't completely mowed down. We actually managed to keep enemies away from our last point quite a long time, and epic battles broke out over the second-to-last cap.
This was Badlands, by the way. I hate capping the one point that's high up on the rocks and thinking the coast is clear and jumping down, just to hear the "control point is being captured!" annoucement and see some fucking Scout up there. Argh. More climbing yay!
And it feels pretty good to Dominate the enemy team's highest scorer. Maybe this Sniper could've avoided his fate if he had just charged at me with the kukri, since it seems to be easier to melée me to death than trying to plant one between my eyes.
But! I've learned to rocket jump! I mean at least I get somewhere with the jumps (couldn't get on top of that building on Gravel Pit Cap B although I tried), so from now on you'll be finding me spamming the spawn exits on Gravel Pit right after the setup.
And I've never been as afraid capping a point as I was today on Gravel Pit. I was on Cap A, with two Scouts. And I was a Medic. Just us three. I have no idea how I even ended up there, since everyone else was fighting over B. But we actually capped the point, the badass Scouts owned the one Demo that rushed the point and desperately tried to defend by himself. Had my heart in my throat the whole time.

And my achievements are broken. I played another round as a Heavy. More than that, I played THREE ROUNDS as a Heavy in CP_Well, and didn't get the bleeding achievement! Wtf! D:
Well at least it wasn't so bad after I actually started killing some people (got pretty frustrated at first: I was shooting where people are and couldn't kill ANYONE) and had some poor Medic sticking to my butt and healing me and it helped a lot. At least I didn't get killed immediately. And don't get me wrong, I still sucked. I just... could've been worse. And I might see myself playing more as a Heavy in the future. I hate his lack of speed and I get raped seven ways till Sunday by Spies (I had one Dominate me within few minutes. Seriously, "get out of spawn, get backstabbed," that's how it went. After that I was paranoid and checking my back constantly and shooting at everyone) and I'm an absolutely appalling Medic buddy and I still can't seem to hit people, but... okay, yeah, I've only played thirty minutes as a Heavy, maybe I shouldn't expect to be great at it.
And of course had to experience the dreadful "click click click" sound right in the middle of an über when we were charging for a heavily-guarded point. Oh crap. OKAY NOW WHERE'S MY SHOTGUN.