What people are saying is that we want a government which represents how *we* voted, rather than the one that we get with our incredibly broken First Past The Post system.
I invite you to consider the Blair government that got a majority in Parliament despite only getting 34% of the votes. I then invite you to consider what it's like to live in a "safe seat" where Party X can parachute anyone they like in to be your MP knowing that the people there would vote for a donkey with the right coloured rosette on it and if you vote for someone else it's a waste of time. Finally try considering the fact that a lot of the electioneering at the moment has been on the lines of "if you vote for X, you'll get Y..."
It doesn't matter whether it's the Lib Dems, the Greens, the Monster Raving Loony Party or even (gods forbid!) UKIP, the fact is that if 10% of the population vote for them, that 10% should be represented in our Parliament or, if not, we could have the House of Lords elected on that proportional basis.
It is my hope that this election will be the last one which is carried out under a system which only benefits the Tories and Labour whilst ensuring that almost nobody else can get a look in and, instead, we get a Parliament which means that if a Party wants to pass the Snoopers Charter or the Bedroom Tax or any other such piece of nonsense, they'll actually have to *convince* others of the value and validity of such legislation, rather than simply bulldozing it through with a sneer because they have a "majority".