There are a multitude of things that SketchUp is good at. In fact, there are a multitude of things SketchUp is world-class at, though there are only two things that it is so good at that there's no direct competition.
There's also two things that are easily the most important considerations when creating 3D assets.
Not surprisingly, these two things coincide with game asset design.
Leaving everything else aside, if you concentrate on these two you will win with asset creation. This is why you should use SketchUp, and why it is ludicrous to use Max or Maya which are designed to be used for all sorts of other things too. They're a jack of all trades, ...