The answer is: could be. You have to get this before a court, the court has to agree with you and the misconduct has to rise to the level of ineffective assistence of counsel. With your guilty plea, it's an uphill battle, but could be.
You have stated case dismissal. No, it would actually result in a new trial. It is difficult as after a plea your rights are often limited. The court is often skeptical of an attempt to withdraw a guilty plea.
This is not intended as individual legal advice and there is no attorney client relationship established by this answer. It is advisable that you seek individualized legal assistance. This is not a substitute for hiring an attorney.
You have court appointed counsel. Unless you are willing to hire investigators and fund a defense, court appointed counsel has little duty to investigate. Court appointed counsel simply needs to protect your rights and observe the basic standards of diligence in our profession. In many cases, that equates to simply conveying plea offers from the US Attorney (or other prosecuting agency) in a "take it or leave it" fashion. Having done some public work myself, there is little budget to pay for the type of investigations that many clients desire. There is a world of difference between public and private representation. It is not that public attorneys and court appointed attorneys are untalented. The bottom line is that defense costs money. When you privately hire counsel, they will advise you how much a defense of this caliber will cost. Keep in mind, investigations must be done by a private investigator that is hired by the attorney at your expense.
Public attorneys are obligated to protect your basic rights. Private attorneys have an incentive to make sure the client is fully satisfied.
If you are innocent, you have to maintain your plea of not guilty. You entered into a plea bargain, and it is very difficult to withdraw a plea bargain. You could still hire private counsel to review the plea bargain and attempt to withdraw it. But, once you have signed a plea bargain, it is very unlikely that it can be withdrawn. Perhaps you could hire private counsel to argue sentencing.
First, it isn't the prosecution's fault that your attorney is not adequately representing you, so the chances of a dismissal based upon your argument that your lawyer has screwed you will not result in dismissal of the charges. It could result in withdrawal of your guilty plea. You need to retain private counsel.As another attorney here stated, a private attorney is charged not only with minimally protecting your rights, but also with zealously defending you and fully preparing your defense. If you aren't paying, unfortunately, you will usually get someone who will put minimal effort into representing you.