What a ridiculous statement.
The European parliament is accountable to the EU electorate, the UK parliament is accountable to the UK electorate. The clue is in the name.
So to suggest that the European parliament is somehow illegitimate because not all MEPs are accountable to the UK electorate is the equivalent of arguing that the UK parliament is somehow illegitimate because not all MPs are accountable to the Scottish electorate, or the London electorate etc.
And the reality is that not a single one of the 650 MPs in Westminster is accountable to the entire UK electorate - they are only accountable to the electorate in their individual constituencies. So only one of 650 MPs is directly accountable to me as a voter - I have absolutely no electoral democratic influence on the other 649. So my influence extends to just 0.15% of MPs.
Interestingly a rather greater proportion of MEPs (7 out of 751) or 0.93% are directly accountable to me and to whom I have a electoral democratic influence in their selection.
I can see we're going to need to dumb this down for you. You seem to have a ridiculously simple view of how democracy actually works.
Lets take TTIP, lets say I'm dead set against it, as a citizen I can attempt to apply pressure to the government to not proceed with this policy. I can vote differently, I can try to change my local MP (who'll bring a voting block with him/her if they are a member of a big party), I can use our culture and request interviewers in the media put this on the agenda, plus lots of other things.
Now I know the US will have a view and certainly the giant US corporations are slavering at the prospect but that would be the same for a UK/US deal.
However the government is also going to be coming under pressure in the other direction from the EU, Germany / France, EU Council, possibly 27 other states who I'm unable to influence in any meaningful way whatsoever.
The EU pressure negates mine, democracy is undermined.
The EU could be reformed to be more democratic but because it doesn't share a culture it will always be a poor imitation.
Also Davey have you backtracked on 'we;ll be poorer if we leave'? Heard Andrew Neil earlier state to a Bremainer every single report says eventually
we'll be richer than we are now if we leave, the point was conceded by the Bremainer.