The Greens seem to me to be the thinking man/woman’s choice
The problem is, like the Lib Dems of old, or the SNP, their policies really don’t bear scrutiny.
Regardless of the right’s/wrong’s their drug policy isn’t a popular oppinion, notice how it’s barely mentioned now that they’ve got the media exposure they’ve been asking for. And really their sums on the economy/welfare don’t add up. They are still a protest vote to the left. That’s no bad thing, it keeps the main parties in line, if there was no green or SNP then labour could/would lurch to the right to get more votes as they would still be the most left option (ditto but less likely, Tory’s and UKIP).