The claim that the moral action is the one that maximises net happiness - the greatest happiness for the greatest number (It is the combination of the equity principle, consequentialist principle and the hedonic principle)
The claim that the morality of an action is solely dependent on the consequences that come about as a result of the action (this means things like intent and character are not considered).
A qualitative account of pleasure claims hat thee are different sorts of pleasure and that these can differ in terms of value (meaning that a small quantity of one pleasure may be of more value than a large quantity of another)
A quantitative account of pleasure hold that all pleasures are of the same sort, meaning that when we say a pleasure is 'better' we really mean that it is 'more'.
Benthams even part method for calculating the quantity of happiness. Asks the agent to consider the pleasure/ pain that will result from an action in terms of intensity; duration; certainty; propinquity; fecundity; (im)purity; extent.
This criticism claims that not all pleasures are good. The strange example where someone enjoys inflicting pain more than it is painful to another seems to suggest that utilitarianism might have to endorse actions that are, so the criticism goes, quite clearly wrong.
The consequences we are aiming for may not turn out to be the actual consequences that happen following our action. We are not in control of this. Sometimes the consequences can be completely unforeseen. It is also hard to balance (and predict) local and global consequences as well as short term and longer term consequences.
This criticism focuses on the ability of a large group to exploit, or abuse, a minority in producing an increase in happiness. As such, an action that would be 'wrong' with few beneficiaries becomes 'right' simply because it benefits people. This, it is claimed, is unjust and ignores the (assumed) rights of the minority.