There are a lot of policies of Labour that I do not like. It is not a hating of him personally (I have never met the bloke) but the way the party is and I think a more central-left leader would make the party more appealing (and have less extreme policies).
Looking at policies:-
Getting rid of private schools and 'redistributing' - there would need to be mass spending to create the school places to cover those children suddenly being publicly funded and taking property from private companies/charities to 'redistribute' is communist.
Privatising public services - a nice idea but would cost the country too much money.
Garden tax instead of Council tax - would massively penalise a lot of people by massively increasing Council tax for anyone who does not live in a big city (no gardens in city flats) but people would not be able to get rid of part of a back garden to try to help themselves.
Lifetime tax instead of Inheritance Tax - may be trying to increase tax on the wealthy, but part of the reason IHT was increased was to try to help parents pass houses on to children without having to sell for tax to get people onto the housing ladder, whereas dropping to about £125k as he though would stop that happening. It would also stop the incentive of working hard and saving if you can get help from the government and have to give any money back anyway.
Taxing businesses more - yes that sounds great (and some should have loopholes closed to pay better tax) but this has to be properly balanced as taxing business too heavily could affect the business leading to job losses and wealthy people will move the money/move themselves offshore to cut the tax.
The people most likely to be affected by the Labour tax are not the wealthy (who can find ways around it) but the middle earners as they will be easier to take tax from and redistribute, so you will just end up with more poorer and the wealthy still sorting themselves out.