Ground Zeroes while a good (not great) game, it's completely incongruous with the series.
Ground Zeroes is the equivalent to operation anchorage in contrast to the greater Fallout series, Ground Zeroes had a borderline impalpable narrative (bar a few very select moments) during the majority of the experience.
I can only offer my own personal endorsemant of the series.
You'll need patience and equanimity to play it, as the gameplay and at times the story aren't forgiving.The gameplay can be especially frustrating in the earlier metal gear games.But the story is responsible for it's salience in gaming and for my own personal adulation.
It's complex and at times convoluted, but the characters and the universe enjoins you to care and to decipher the gallimaufry of thematic twists and nuances presented. Characters like sniper wolf, Hal and psychomantis are characters I'll never forget with plot moments I'll never stop contemplating, and twists that are still discombobulating.
Fallout, Metal Gear Solid, and Bioshock are the only games series I really 'care' about, and are among the few games I remember and wish to do so.
You may hate the series, but the potential rewards for trying are immense, with few games offering the story, universe and characters it does.
Edit:
If you're going to try the series, you have no alternative but to play all of the games (ideally in the order of release, or at least in the order of the big boss saga) or you'll just be confused throughout the entirety of the storyline.
It's not like Fallout or Final Fantasy, the stories are directly tethered to each other across each game in the series.
Each game serves as almost a T.V episode that continues on to the next one forming one complete series of events, and not something that can be enjoyed as independent stories like other games.