I think there are more than a few cases of the HPFP issue, but I also think BMW is standing behind their product. A lawsuit would only be warranted if BMW abandoned their warranty obligations.

The turbo issue isn't as clear to me. I don't think the wastegate rattle was a big issue (it was annoying to some owners). However, the fix bothered some owners because they felt that throttle response had been changed. I understood that they were able to go back to a previous software version in some cases. Owners were more upset about BMW changing the software than either the problem or the fix, on many boards. I have been happy with throttle response, and frankly I have no idea what software version my car is on.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue