It amuses me that the marshals can teleport around Texas like that - in the 2nd episode they went from HQ in Houston to Odessa/Midland (where it had just rained? really?) to Dallas to Galveston (then flew to Vegas) all in the same day! Or it looks like the same day, Annie wears the same shirt throughout and the cast are not shown going to bed or checking out of a hotel in between. And the bad guy can also drive from Galveston to Vegas in seemingly a few hours. Anyone who has actually spent any time living in Texas or the West will know that it's several solid days of driving to duplicate either of these paths. The marshals just "poof" appeared in El Paso in the pilot, as well.
I understand that viewers probably don't want to watch a boring drive between cities, but it seems like the writers are just picking familiar city names off a list without looking at a map. Or if they do have a map the scale is missing...Texas is *big*, I've spent a lot of time driving across it although I don't live there any more.
Other than that though, the show is watchable for what it is. Not terrible.