It's always good to get a second or a third opinion, so I looked up the Gramophone review of Rattle's Planets with the Berliners, and found comments such as 'blazing brilliance, warmth and weight'; this Mars is described as 'more menacing' than Rattle's earlier recording (itself considered to be 'excellent'); the 'incandescent form' of the Berliners is referred to. In short, there's not a negative comment in sight, and the reviewer can't praise it highly enough. I'm not suggesting Gramophone should have the last word, by any means; just that it's another view. Adding to that my own impression, having listened to MI's youtube sample a second time, I find myself puzzled about why this might be described as 'tame' or 'lacking in tension'. The overall outcome is that I'm now very interested to hear the whole of Rattle's Planets.
Of course it may be that I find Steinberg even more exciting, when I hear his interpretation. That would be marvellous. But I'd be very surprised (and disappointed in my own judgement) if that then makes me think that this Rattle 'Mars' is poor. We're looking at different degrees and types of excellence here, not stark differences between good and bad.