The Gold Standard of fast food burger chains. You really can't beat the value (quality for price) you get from going to In-N-Out Burger, especially when compared to other Vegas eateries. Make sure to study up on the "Secret Menu" to prevent yourself from saying, "That's it?", when looking at the menu for the first time. If you only remember two words, let them be "Animal Style".
Good: Price and Quality. Where else in Vegas near the Strip can you get a good quality double burger, fries, and shake for around $7? The workers took their time and showed enthusiasm, which is always a bonus for fast food. Location is close to Strip. If you don't have a car you can still walk there. While it's on the North of West Tropicana Ave. past I-15, take the sidewalk on the South of W. Tropicana Ave. (Excalibur side, not NYNY side) and head West. There is a walkway that loops around the overpass and you can make it there safely via sidewalks/crosswalks. Don't forget about the store on the North side of the restaurant. Very reasonable prices for merchandise.
Cons: It can be busy. Don't try and go during peak times if you are in a hurry. Once you become a regular, newbies will start to annoy you.