I came here a few weeks ago and it was nothing much to get excited about. They have your typical food court and standard shopping stores that you would expect at any mall.
If you don't like crowded malls then you might enjoy Fiesta mall but there are other better malls that you should consider. Don't expect anything out of the ordinary here or what you might enjoy at your regular mall. All in all Fiesta Mall is mediocre.
From the malls I've been to thus far, Fiesta Mall would be in between Desert Sky Mall and Arrowhead Mall.