I agree with the original poster. We have a VERY weak squad; the new manager faces a situation almost as bad as the one Moyes inherited.
While Jagielka and Baines probably have a season or two at the top left in them, they can't be considered as part of the club's long term future. We desperately need a goalkeeper, Robles is a second choice at best. Midfield is weak; Barkley is promising but Barry is nearing the end of his career, McCarthy was poor last season, and Gibson and Besic are both injury prone and cannot be depended upon to feature in more than about 50% of our games, while Cleverly is not good enough. Lennon is average at best; Oviedo hasn't recaptured his pre-injury form; Kone and Niasse should never have been permitted to join us, they are wage drains and nothing else. We've lost Howard, Hibbert, Osman and Pienaar. Mirallas and Lukaku are both gifted but inconsistent; the same must be said about Deulofeu.
There are isolated bright spots like John Stones, and we have some promising youngsters coming through. Also, fitness should improve markedly, whilr Koeman will, I am sure, be far superior to Martinez. He does, however, have a massive task in front of him.