At one club, I experienced the following defects within 3 weeks:
-fuel cross feed pipe leaked into cabin, onto me, rejected aircraft during taxi
-brake flexible pipe not secured to wheel strut - rejected aircraft during preflight
-PTT detached from yoke during flight, used RHS yoke button
After that I did not go back, who knows what might have happened next
Then I found a place in Cambridgeshire who maintained there aircraft to the highest standards and I never looked anywhere else again.
The feeling of confidence that gave me was many times the value of the £20 extra per hour.
IO540, the poster said the droplet was coming from the ball valve in the fuel drain, presumably under one wing, so I can understand the FI not being overly concerned as a one off, but if it isnt fixed quickly, it doe s suggest a potentially lax approach to maintenance