Thats your own choice. One thing you need to be concerned about is YOU. You queued up for this 25 minute game and you're going to adopt the defeatist attitude just because your team fed a few kills. If you spent a couple of more minutes trying your hardest, you could've made a comeback and potentially won that game, saving you from having to play an extra ranked game in the future to gain back the LP you would've lost from this game. Its ONE game. Who cares if your team feeds? You have a high chance of not getting the same 4 players in the next game. If these guys are actually bad players and not having just 1 bad game, they'll eventually lose the elo they got from this game. You need to set YOURSELF up for success.