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You'll see that the Accent gets 3 stars front side and 2 stars rear side so the MINI is better than an Accent for side impacts where tested. Some cars get 5 stars in one or the other for front impacts so there is room for improvement in the MINI. Many other cars are worse on the side than the MINI so they have room for improvement also.
Also note that most of these are 4-door cars. Many 2-door cars tradionally are much weaker in side impacts with the larger door and lack of a B pillar. For instance, look at the coupe versions of the Cavalier and Sunfire in the Compact class with 1 star front side and 2 stars rear side:
The ZX2 is also very poor and many other coupes are not tested.
They haven't tested a 2-door Golf for some reason but the 2-door Beetle gets excellent side impact results so the Golf is probably good as well.