Monica I agree there is nothing wrong with a Conservative MP or an MP from any other party being wealthy, but the matter that was being discussed was rich Labour MPs. However, I feel that if a wealthy politician is seen to use his/her power and influence when changes to regulatory issues relating to tax and other financial matters are being discussed then they are not acting in the interests of the whole population but of themselves and similarly wealthy people.
I agree with you that there are politicians on all sides of the political spectrum whose motives and actions may be viewed with suspicion. In such instances, I think it is perfectly reasonable for people to comment on such matters. When Alan Duncan pontificates about "achievers" and "enterprise" when his own behaviour in office has not been exactly "virtuous", as you put it, he deserve to be criticised.
As to the capacity of someone to "run the country", it is very much a matter of opinion as to whether this government has done a good job in that respect. Despite massive public spending cuts, the Financial Times and City AM point out that several of George Osborne's economic targets have not been met. In trying to "shrink the state", this government has created chaos in the NHS, stagnating or falling wages, insecure employment and any number of other social ills that leave the UK's population in an unhealthier, less educated and poorer state than when the Conservatives came into office. An example of this is the recent UN reprimand to Britain for failing to improve children's wellbeing, with the disclosure that the UK is ranked 25th out of 27 wealthy countries (behind Poland, Romania and Slovenia) for children's health and educational outcomes. In the 6th wealthiest country in the world, I don't consider this to be an indicator of a successfully run country.