Because of the absence of a cell wall in an animal cell, the animal cell has quite a few advantages. Firstly, the animal cell is more flexible and mobile compared to a plant cell, it is able to squeeze itself into tight spots or fold them selves. This makes entrance into tight spots easier compared to if it had a cell wall.
Secondly, the transport of food, water and other important materials needed by the cell would take a longer time to reach the cytoplasm due to the cell wall although it may be totally permeable to every substance. To us, the cell wall may not look that thick to us at all but if you ever thought of it in the aspect of a tiny food molecule, it would take us ages just to travel a few micrometers which the cell wall provides. On top of that, secretions from the cell like proteins and energy, would take much longer to be released from the cell if it were to have a cell wall as it would take extra time to travel out of the cell just as it would to exit. This would cause athletes to feel worn out faster because of the lack of energy when there s a sudden need for it. The journey to the cytoplasm and from it would be indeed much shorter without the cell wall.
Another advantage is that without the cell wall, animal cells are much more mobile.
Think of the cell wall as stilts under a kampong, it is a foundation for the plant which makes it more difficult to move around but the plasma membrane which is thin and flexible, the animal cell is like tent which is a portable house.
As for the disadvantages, without the cell wall, the cell once placed in a solution with higher water potential will constantly keep absorbing water until it bursts. With the cell wall like in the plant cell, the cell would not burst but become turgid. This means that if we stay in a swimming pool too long, our cells may burst due to the high water potential in the swimming pool.
Another disadvantage is that our cells are extremely vulnerable to shears and are more fragile compared to plant cells. This means that our cells are much more easily damaged by abrasions or collisions from other cells.