First point: I'd have to disagree there. A Government with a strong enough majority (Like Labour 97-01) was able to implement many new policies as the opposition (rejected by the electorate) wasn;t strong enough to oppose them. And they were clearly popular policies as they were voted in again.
Second point: The House of Lords can veto, but the House of Commons has the power to abolish the House of Lords, especially if the public was behind one of the motions put forward to them. It's a case of scrub my back, i'll scrub yours. In either case, the EU has had no influence here; unless it goes to one of the many European Courts, again highlighting their totalitarian aspect.
Third point: Can't see how any of that would affect Britain in the case of a exit.
Fourth point: It gives us no right to vote on future EU matters, no. But by then i'd be more concerned with getting our own house in order, which is kind of the point. Trade negotiations however have to be agreed upon as per Article 50 of the Lisbon Treaty.
Fifth point: The FPTP is indeed flawed. We tried to change it with the 'Alternative Vote' back in...2011? It failed, but again, as highlighted, this isn't about getting the choices we PERSONALLY want, it is the collective vote of the British voters and the path we choose for ourselves and ANY vote we undertake is a result of one side of the debate being more convincing that the other, instead of..."We're the EU....you do what WE say, you don't have a voice."
You call it mob rule, I call it direct democratic method. If something is being implemented you don't like, call for a referendum on it, propose a convincing argument, but don't cry foul if others fail to be convinced.