Although I've seen some disagree, I think the SLC has several good Thai places.
Sawadee -- Downtown area, draws a more upscale crowd. Seems like solid food, more refined vs more of a home cookin' type place. They don't ask how spicy you want stuff, or at least didn't when I went. Some things on the menu are just listed as spicy. I thought some of their stuff was really good and some pretty underwhelming.
Here's my Yelp! review of Sawadee
New Thai Cafe -- This has been my family's goto Thai place. It's close enough to our house and it has been very consistently good for many years.
Here's my Yelp! Review of New Thai Cafe
Thai Delight -- Very nice fresh flavors but I think they use a different spice scale for white folks or this place just doesn't go too far with the spice. I order a 5 (their highest level) and it's not hardly spicy at all for me. I do see a lot of older customers so maybe that's their market.
Here's my Yelp! review of Thai Delight
Mekong Cafe -- Really nice place that's been around a long time, easily since the very early 90s. This is their third location but they've always been in Midvale.
Here's my Yelp! review of Mekong Cafe
Tuk Tuk's -- I just recently discovered this place and I've only been once, but I was really impressed. I need a few more visits to make the call but I think they're my favorite.
Here's my Yelp! review of Tuk Tuk's
Thai Star -- Not going to say much, it's out of my way and not a place I seek out when I want Thai food.
Here's my Yelp! review of Thai Star
Dee Garden -- One of the newest places on the list. They have both really good and pretty disappointing so far but maybe they will figure it out.
Here's my Yelp! review of Dee Garden