We were pretty excited about our carrots but when we finally pulled one of the 'bigger' ones out, it turns out to be little pipsqueak. It's a tad small for Kieran, who polished it off in one bite!
I haven't figured out what went wrong, but I suspect that soil is part of the equation. Anne has a basil experiment in her garden that demonstrates this well. Another somewhat supportive experiment is that Maria has the exact same tomatoes as us yet hers are probably four times the size. I know for a fact that she has first-class soil (though of course this is not a controlled experiment - many other differences too!).
Despite our rather measly yield, I'm still pleased to have the occasional snow pea (probably a dozen or so by now but dwindling); and to be able to harvest greens and kale for to freshen up our salads.