Sniping with a wrangled Mini-Sentry gun feels so good.
I was on 2Fort, and I got an achievement, unlocking the Gunslinger. I could now build mini sentries (and had +25 max health). These build 3x faster than normal sentries but can't be upgraded. I put one up on the battlements where snipers usually reside, so my minisentry had a vantage of oncoming enemies.
They only cost 100 metal, so you can build two (one at a time) before running out.
I also had a level 3 Dispenser near me, so I could refill my metal supplies to replace any broken minisentries.
Then, using my Wrangler, to take over the aiming system of my Minisentry, I saw a sniper on the opposing battlements. The best part about the wrangler is it projects a shield over the sentry/minisentry, reducing incoming damage. So, because sentries can't be headshot, having no heads, and the shielding nullifying 65% of damage, I sat there gunning down incoming fighters alone for the first 10 minutes of the match. Until a spy managed to sap my sentry then get away...
But, because I had the Frontier Justice (gain 1 revenge crit when sentry is killed per kill the sentry did, EG 1 revenge crit if it killed 1 before blowing up), I then went on a rampage with my 12 free criticals, ripping a hole through most of the opposing team before being killed, allowing two Scouts to push through to the intel.
Team Fortress 2 on 2Fort.