Yeah, everyone hated the TCA because they used one of the multiplayer missions that gave the green team (teams selected by host) an advantage, and used it always as their SquadWar defense mission, when they'd be the hosts. They also usually all took fish, and spammed it to lag the other team, while the host picked them off in their packet loss hell (this was when game elements lagged the game due to the prominent days of the 56k and 128 ISDN). It's why when I ran the SSC to the top with QD, we only had 12a NWTR as our defense. No excuses, fair game, good host.
Also, they were a bunch of childish pricks, so that didn't help, G'kar "the leader" most notably, and Vertigo.
4th was hated because DW, most notably Mustang and Suzanne, lied and slandered quite a lot, and because Mustang had the SSC Black Widow reputation he didn't deserve, everyone chose to believe them instead of the 4th, plus Starlegend and Blade didn't help matters with being quite explicit and coming off as rude children, but then again they couldn't help themselves, what with being violated and betrayed by the DW top squad of perpetual asshattery.
It's quite a shame I myself took too late to getting on the 4th's side, and see they were the ones in the right (past the insults and bull****), especially since it was me personally who cost them their league victory, due to being blinded with Mustang's bull**** as well.