It’s probably just the MAX variant of the 737. Overall the 737 is an incredible craft and flies 100,000 +/- successful take-offs and landings every month around the world.
The 737 MAX is slightly different - it has more powerful, ‘fuel efficient’ engines, but they are also much heavier. That changed the weight distribution of the plane and causes the nose to tilt up in flight. To accommodate that shift in weight they made the wings wider and mounted the engines in a more forward position. Ordinarily this kind of situation can be adjusted by the pilot of any craft. If the nose is constantly tilting up, or if it constantly changes direction left or right the pilot can ‘trim’ the flight control to adjust for these shifts.
Seemingly, the 737 MAX has some sort of automatic system to do this for the pilots, and the pilots were not even aware of it. And then if some kind of alarm goes off saying the plane is stalling, they are trying to fight the auto-controls. We don’t yet know all the details but there may be some faulty sensors or sensors that aren’t programmed to know about this auto-adjust system. If the plane thinks it is in a stall (loss of lift) then the first order of business for the pilot is to nudge the nose of the plane down. But they may be over-compensating or not even aware that they are actually pointing the nose down towards the earth. In the first few minutes after take-off there is not a lot of time to figure it out and take corrective measures.. especially if you don’t even know that the plane is either fighting against you or trying to do what you are also trying to do.
Sounds to me like the plane has a design flaw. If you need a computer program to make a plane take off without crashing, then the plane is defective. This is not your father’s 737. If a pilot can’t take full control at any time, then the ship is not airworthy.