They're kinda hit or miss. I've stayed in a couple. I've found the ones by the airport are typically really nice (like this one I stayed in Dallas one time was gorgeous, right by the airport, and had extremely comfortable beds) but others are not so great.
I'm pretty "brand loyal" to Marriotts and Westin's, personally.
I like La Quinta. It isn't up-scale, but it isn't trashy, at least the 2 we stayed at. Both times were in winter so DD loved the indoor pool and the breakfast was good. Both times were in Springfield MO.
They're Ok for the most part for a 3 star hotel. Some are nice and others I wonder about. I stayed at a Radisson recently that made me angry we paid as much as we did and it's in the same rating. They stated they were a hotel, but there was only exterior room entrances, which means it was a motel. Also, the amenities were lacking. I never stay at places with less than three stars anymore because I don't want these types of places and I was pretty angry about it. I let them know, too. Yet, I have stayed at other Radisson properties that were pretty nice. It really depends on the location and who is managing the property.