The entire point of some of the alt-coins was to address all these complaints. So instead of piling onto Bitcoin which is years of stuff we already know about, focus on those alt-coins that support the ideas you want in a cryptocurrency.
I've been reading about the tech behind bitcoin and I find it interesting yet have been skeptical due to some perceived flaws. I've been concerned about the market externality due to the amount of energy it takes to mine blocks. What are some alt coins worth exploring?