While my experience with BMWs may be thin, it's not uncommon for a u-joint to sling grease, especially a grease-able joint. But I don't think you've got a lot of grease getting slung.
I would also caution as to what defines a good or bad joint. In fact, unless seized, a perfectly new joint will feel stiffer (i.e., less play) than one with more wear.
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2018 X5 xDrive35i M-Sport - Traded
2013 X1 xDrive35i - Sold
1986 320i - Sold
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