Oh, yeah. Not as much as the judge, but the quality of presentation of your client's case is all on you. If you knock it out of the park, you could do as much as save a life, whether guilty or not. If you fall down on the job, you could potentially be responsible for someone being executed or imprisoned for life or, on the other end of the spectrum, let someone go free who shouldn't be. Much of it will be determined by the evidence, but your powers of persuasion will have a lot to do with it as well. "Being a good liar" is an excellent special skill to list on your professional résumé.