Ok - the 07' 335i is supose to be the one to stay away from due to reliability.
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Well I beleive that most buyers are really complaining about & seeing the results of an inadequate "maintenance schedule". Yes - the 335i requires the OLD SCHOOL BMW maint & most 335i's are neglected with only inferrior standard maint.
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Buying a used 335i without CPO and History is a mistake.
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My CPO 335i - purchased with low miles and smothered with maintenance - purrs like only an in-line twin turbo 6 can.
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5yrs and 80k she still has my riders -- saying WOW!
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The thermostat / waterpump is and continues to be the one design flaw that I really hate.
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I have not seen a 4dr Car that even comes close to the value and performance of my 335i. I plan to keep her another 80k --- so keep on trashing and complaining about reliability. I'll just keep laughing at you and your lack of traditional maintenance.