Don't fret Lass, what you need is to have a different mind set.
Yes, your crop could be described as a little underachieved, but with your crop being a little better, Autumn onions are very useful. First of all be wary of many red onions, they often fail more than the whites/yellows.
My results were about as expected. I planted 50 Senshyu and 50 Radar onions. 10% were a total washout that never did a thing, and often happens with a proportion. Probably 15% went to seed but those are always used as green onions from April onwards anyway. 15% ended up quite small. That leaves 55% as good sized eaters. With experience you'll soon get to that percentage and higher. One thing you do end up noticing is which batches and varieties perform better. The Senshyu this year were far better than my Radar.
So:
1.... eat those throwing up flower spikes as very tasty green onions.
2... Use the smaller onions also as green onions also, or as pickling onions when ready.
3... These onions stop you munching into your Summer onions too early.
4... The crop helps a tad with stopping some beds being left bare over Winter.
5... Virtually no effort required with over Winter weeding.
6... They render a bed empty in May to June which is always quite useful for eg.later brassicas/sweet corn, or a Summer green manure sowing when it is warm enough to get a fair bit of nitrogen out of legume manures.
When viewed as above all of a sudden the crop is well worthwhile for the little effort, and no more than a £1 or two. It's all about understanding why different crops are sown. Japanese crops have a quite different purpose than the Spring sown. White rot apart, I get 90% success rate with Spring sown, and they store so much better.