Saints Row: Gat Out of Hell fails as a standalone release due to its barebones story and missions. However, it is more of Saints Row which could be enough for some fans as it still retains the best parts of the series, just not enough for all.
Saints Row: Gat Out of Hell
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Critic Reviews for Saints Row: Gat Out of Hell
For all the things Gat Out Of Hell could or ideally would do though, it's important to remember what it is - a standalone expansion. Go in remembering that, and knowing about the lack of missions, and it's a pleasant surprise how much it at least tries to offer within its limits. Just don't expect it to be a sequel, or even a full slice of Saints Row 4 at its best.