We have good explanations for every step of evolution towards more and more complex organisms ... but at the same time we shouldn't forget that microorganisms (as well as comparable simple multicellular organisms) are still very successful participants in the big game of evolution (for example in terms of the number of living individuals or biomass) ... :)
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For sure. In fact I'm pretty sure there's more total biomass in microscopic form than macro... yeah a quick google shows there's up to 550,000,000,000 tonnes of bacterial biomass alone, compared to under 500,000,000 of human... phew!
Worth a post in itself, I think, they deserve the credit =)