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Good savonius needs some cover and a funnel to direct air into it, there are some designs that are hugely better than base design.
However Savonius is not about maximum power, it is about usable power at low wind and when wind direction varies a lot, also when tower is not possible Savonius is good as it does not matter which direction wind comes. But if one wants some big power, like heating, I doubt that Savonius would be good choice, one can't heat with low wind, there just is not enough energy at low wind for that.
Savonius and those old farm waterpump wind mills are good for wind speeds that are below 3 blade turbine startup speed and I think that is only why those would be choices, when one needs to get little power always, but these typical 3 blade rotors are lot better in other situations.
Both concepts have however their places and either type can't beat each other in other one's territory, so there is no reason to dislike them for what they are, only dislike when they are put to wrong use :P
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