Forums like this one tend to be busier with people complaining than with the people who are content with their car. Especially as there's no real timeframe after which people say "I've had no problems with my car".
I've also seen the same people posting repeatedly about their poor experience. I can understand their frustration, but I'm not sure what it achieves. Why hang around an MG forum when you're driving a Mégane? (But obviously that's just my opinion; they have every right).
Likewise, to be honest, posts like yours will, for some people, reinforce the idea that the MG4 is riddled with faults. But you have no personal experience, real evidence or statistics, just anecdotal evidence. When folk list the issues people have had, it'd be good to balance that with the positives.
That's just my tuppence. I hope you enjoy whichever car you go with.