MPs tend to vote with their party ignoring constituents wishes which is undemocratic
Government controls the commons as it has the most number of MPs so its bills rarely fail
Process is slow and detailed as some bills run out of time and fail which looses the bills original intention
Lords have a big say on whether the bill is made into law or not as they can choose to object the bill and are unelected and have no constituents to answer to and can even block the will of the democratically elected commons
Some lords are old and out of touch and some are hereditary peers
Parliament acts cannot be ignored as its undemocratic to ignore then as they have valuable input
Private member bills have low chance of success because of low support only 20 MPs a year are allowed to raise one and may be disallowed due to lack of time