As a United only flyer T3 is where I depart and return to Vegas. The set up if the Terminal is very good and movement from ticketing to the gate is a breeze. Even though a tram ride is involved even it moves fast since they have 2 lines.
The food selection is ok with several choices of eateries to choose from. Since I am not a big fan of United's food for long flights I get a sub from Port of Subs to avoid the United Diet.
The drop off area is very nice and we have never had issues with getting a spot to get me out and on my way. Same can be said for the pick up area. The wife parks in the parking structure near the walkway I always come out of.
The slot machines inside always make me chuckle. I always see many of them with gamblers at them. I guess they are hoping to change their luck prior to grading out.
One thing they could improve is the buses to the offsite Rental Facility. I have came in and picked up a rental one time and I will never do that again. Not well organized and also not enough buses. They stuff the bus and the wait to get to the site can be 20-30 minutes. That is the worst of any airport I have ever flown into. Hopefully they will dis this. Even Baltimore had a better setup than Vegas! Hopefully they sort that out soon.