That's the nature of parliamentary democracy, to an extent. And at least part of Corbyn's project is to democratise the party, so at least members have a much greater say in policy-making.
It's because Labour are/should be the future and there's not much to say about the Tories beyond "aren't they shit"
Or that's it for me. I want a better future and an Opposition fighting the government for the things I want and Labour are almost there but with a load of not ideal compromises and incompetencies that upset me a bit