I know bad teammates come with Splatfest, like that's standard stuff. It's kinda annoying seeing someone go 0/5 with the bamboo or E4K and ink like 300 turf, but that's standard TW fare. You're kind of expected to carry games every now and then.
It's D/C's that are a massive dud for me. Unless your team can regularly score double kills, you're working up sharply uphill as you have 1 less ink tank to cover ground with, which is a problem because that's exactly the objective in TW. All it takes is one wipe and you're not coming back, unless you get a miracle or the enemy team has the aforementioned bamboo/E4K on their team. Talking about that...
This shifty station is in particularly bad because of that, you're not claiming their objective with just 3 guys targeting the tentacles leaving a good chunk of their turf unclaimable. They will easily steamroll through yours, allowing access right to your spawn where they can commence the spawncamp because there is only one way out of there. If this happens you might as well just wait it out and take the loss, you're not coming back because you have to tunnel through their team, their 2-3 tentacles, and then reach their side somehow with one less person.