A
chord built only with a note, a
third above it, and its
perfect fifth I have always found to be boring. It is too stable.
Called a triad, major if the third is composed of four semitones, and minor if the third is composed of three semitones.
For my own playing--improvisation actually--I prefer the instability of an added seventh above the root, a minor seventh is OK, but a major seventh is far more interesting to my ear.