Actually, MEPs often vote on far more important things than MPs, because too much power has been handed away.
Fundamentally, I believe decisions should be made as close to the people as possible.
As far as possible, people should be free to make their own choices, providing these are not directly damaging to others.
Far more power should be then given to local authorities. If this results in postcode lotteries, then so be it.
Far more power should be held at national rather than supranational level.
The only issues which should be decided at supranational level are things which genuinely require it. War, free trade zones, climate change are the only big things I can think of.
A change in the electoral system which devalues localism and shifts the balance of power towards the political elites is bad in my opinion.