Which champion do I choose?

So let say you join a rank queue and notice 3 or 4 people on your team picks fully damage champions with no cc (Like master yi) and now you are at a dilemma on deciding which champion would be best for this unfortunately common team comp. Obviously another dps champ is unnecessary, but do I pick a tanky champ? supportive champ? mix? Maybe there is a certain champ that is the "to go" for these situation? HELP!