Some notes from my little run through:
1. It's prohibitively close to impossible to get the ball between the flippers. It's a veeeeeeeeeery tight fit between the ends of the flippers, and, couple this with how heavy and barely responsive the ball is, scoring goals is one hell of a chore to do just once, nevermind three times.
2. The areas around the spawnrooms are pitchblack. A little light goes a long way.
3. There's a few easy ways to mimic ladders in TF2. There's
these ones here that are detailed in the Developer Wiki. Or, if you feel like making players work a little for it, as I did in Ladder Match Melee Fort, you can make small invisible rungs out of nodraw or playerclip brushes, and space them vertically just far enough that players will have to jump repeatedly to "climb" the ladder.
3. There's still the issue with the push trigger brush for the middle serve pipe making the ball pop up in the air when it gets close.
4. Use Vscript to set sv_turbophysics to 0. This will make the ball solid to players, and will deal damage if it hits them fast enough.
Now, this is just my personal philosophy on Pipeball maps, but I think it should be much easier to score, and the ball should be quite a bit easier to push. In my experience, if players are locked in an endless back and forth with barely any scoring, if at all, it just gets them angry and frustrated with the map, and they give up on trying. The way I look at it, scoring a goal activates that primal reward center in the brain, keeping players engaged and wanting more. There still needs to be a challenge, sure, but if 90% of the matches end in stalemate or sudden death, something has gone very wrong.
I think your map is still salvageable, but it's got quite a bit of work ahead of it.
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