Yes, Pull-Ups Are Awesome Even If You Can Only Do A Few
You should do multiple sets of chin-ups, using negatives to get a larger total number for the workout. If you can only do three pull-ups in a set, then do three--strict ones, good ones, all the way down and all the way up--and then do another three as negatives (jumping to the top and lowering yourself down as slowly as possible), then wait three minutes and do it again, then wait three minutes and do it again, then wait three minutes and do it again, then wait three minutes and do it one last time. If you can't get three every time that's fine. Use the negatives to get five or so in a set, and do several sets.
If you can't do even one full range of motion strict no-kipping pull-up, the lat pull-down machine, assisted pull-up machine, and bands would also be called for.
You should also do bench press or push-ups or dips to build the opposing muscle, for both health and looking big.