It's a perception thing.
In general, the last thing one sees a character doing is what you'll think they keep on doing. So, Normandy crashing on a planet and the crew stepping out? Yeah, last thing we see if them looking at the sky with the Normandy definitely not looking space-worthy. So, we extrapolate subconsciously that they've stranded, as we never see them doing anything else. It's the final shot, even. Now, logically, it's good practice to survey the area, set up camp, and see if the local flora and fauna is edible or hostile before settling in to do emergency repairs to the spaceship. Which is what you see them begin to do.
It's why the end where the hero rides into the sunset works so well. You know he's off to more adventures, and he'll keep doing that until you see him again. So, yeah, logically, it's not a problem, especially if Tali is there. But people aren't very logical.
How long until it gets on Origin, by the way? I got a legend save and a female Shepard parked and ready to go to end both my ME1 to ME3 games. Thinking Synthesis and Destroy respectively.
