Leaks around chainplates and hatches are not uncommon and not a crisis unless they have caused extensive core damage. Odds are if the boat is leaking all over, it has been leaking long enough to have extensive damage and if you're unfamiliar with checking for that, you need a surveyor.
A leaking hull/deck joint is something more problematic. In order to fix that--and it can be fixed--you need to work with two people, one inside, one outside, going down the whole length of the hull, unbolted it, opening it up, cleaning it out, rebedding/sealing and rebolting. That can be one VERY long job.
With all that leaking, you also have a PO who has been ignoring important maintenance so the odds are the engine oil isn't changed regulary, etc., either.
Still, if the price is right...and you have the time to invest in repairs. But if you think you'll be getting in over your head, better to buy a boat you can just SAIL without a year of fixing and worrying.