Liverpool derailed a long time ago, no big player goes there anymore.
Big players want to leave such as Suárez, Torres, Alonso, Mascherano because after a year carrying the team they realise it's just not going to result in trophies.
They realise they are much bigger players and could play for Europes Elite.
Managers go in energetic and happy at a big job and wanting to restore the aura of the club but leave jaded, fatigued and every day is groundhog day for Liverpool, the same song sung at each kick off.
Each season new names arrive and because they're played at a sub-par team in a big league they're suddenly a hidden gem (Matip), other players like Sanchez decide I'll go to Arsenal instead.
Yet United sign someone like Martial for a big fee, Shaw for a big fee and it's a huge waste of money. 2 Years later, Moreno didn't pan out, Suarez has left, Sterling gave up, Sturridge is injured, they're left with a "hard-worker" in the mould of Kuyt for a captain and it's back to how it was under the latter stages of Rafa.
You just couldn't write what goes on at Liverpool.