Yes it's reliable. So was the 727 and the DC-8 but they don't make those any more, do they? There's many good reasons they don't make those planes any more despite their reliability and value at the time of production.
The 737 has been obsolete for decades but instead of designing a brand new plane to compete with the likes of Airbus, they've kept the 737 on life support to save time, money, and the expensive and time-consuming need to retrain all pilots to fly it. Every change necessitates other changes, and the latest round of changes required the implementation of the new MCAS equipment/software which has you terrified of ever flying on a 737 Max again. And it's not like they can just remove the MCAS - it's there for a reason, namely that the new design characteristics of this plane necessitated a new safety system because of the altered dynamics.
Over-extending the operational life of a plane originally designed starting in 1964 to compete with much better (and newer) European platforms is a pretty good example of the typical American business arrogance and corner-cutting that really torques you off, no?