It depends entirely on your own skill and how well you can gauge the situation. If you think you can pull through and make the best of a bad situation then by all means go ahead and make it work.

The prospect of being able to win depends entirely on your skill to be able to judge the odds of your team. Sometimes, having the odds stacked against you to the point where you can't really rely on your team and think surrendering is your only choice is not something to be scorned either. The sooner you reach a conclusion, no matter what it is, the less salty everyone will be and the less time they will have wasted.