Honestly, the perspective of what constitutes a functioning public transit system depends a lot on what you have as a point of reference.

I’m portuguese but I lived in Germany for 5 months during which I used exclusively public transports and bikes. Central Europeans complain a lot about Deutsche Bahn and indeed during this time I saw a few strikes, delays and suppressions. However, transports were still much more reliable and much more frequent than I’m used too so I could never really consider it problematic, although my Central European friends complained a lot.