I don't like weak plots either but a simple plot doesn't need to be a weak plot. As long as the plot is believable and is moved along by causality, it doesn't need complexity for the sake of it, but of course that depends on the genre.
I'm thinking of some great novels with very simple plots, such as The Remains of the Day, and The Little Stranger. Both have very simple plots, and very, very complex characters... But that's literary fiction. In commercial fiction I'm thinking of Me Before You, a very simple plot with complex characters. There's nothing weak about these plots.