Does your lawyer return phone calls or emails on a same-day or at least 1-day turnaround? Does he have a good reason when he doesn't? Does he copy you on important correspondence, orders, and pleadings?
Note: your idea of speedy communication may be unrealistic. Make sure you both agree on a communication plan before you hire that person.
Does your lawyer work on your case in a reasonably timely manner? Do you both agree what "reasonably timely" means?
Misses important deadlines
If your lawyer misses deadlines or forgets court dates, you should seriously consider obtaining new counsel.
Don't fire your attorney yet!
Sometimes it is better to keep a problematic lawyer if you are close to a trial, hearing, or other event and there is not enough time for a replacement lawyer to prepare. A judge may not allow the attorney to withdraw from representation; the lawyer ought to be able to tell you if your case is before such a judge.