The problem you get is that the landlords and tenants never get the landlords and tenants they deserve, leading to cynical attitudes taking over.
Landlords may have tenants that don't pay, so they protect themselves by insisting on joint contracts rather than individual ones. This means if your housemate fails their exams or drops out then you have to pay their rent if they don't, and can be thrown out if you don't cover their rent. Equally you can sue your ex-housemate for what they owe you, but its down to you to chase them, not your landlord.
You will also get tenants that trash the place, so the landlord may be loathed to put in nice furniture knowing full well it will only last a year and cost more to replace than could easily be taken out of deposits.
On the other side you will get landlords that treat the deposit as extra income, so the tenants withold rent to the value of the deposit knowing that they couldn't be evicted in time before their contract expires.
You will get landlords that leave the property in such a state at the beginning of the contract that the tenants don't care about keeping it from getting worse.
Probably the worst landlord/tenant dispute I've heard of was when a group had signed for a house around this time of year, paid rent throughout the summer but were told in no uncertain terms to go away by the occupant of the house when they came to move in. It turned out the house was in the name of the wife of the landlord, and as they had split up she had taken the house for herself. Legally they were told they had no right to evict her, but they could sue for their deposit and rent back, but they still had nowhere to live. Palatinate reported on it at the time. I think they were told to go home to their parents until sufficient freshers dropped out and there was space for them in college.