I would define any year with a negative draw-down as unsuccessful once a trader becomes profitable. The expenses a retail trader has a sole source of income warrant an increasing equity curve not just steady returns, as you mentioned, health insurance, high tax on gains, etc.
Trading is becoming even more futile for retail traders, I advise them to abandon this lost cause, due to the recent advancements in technology. You can say you're not competing with institutions but your stops and limit orders are filled or not filled due to their algorithms.
Something still doesn't make sense.
1) You a retail trader ? Yes or No (I've again asked this question)
You specifically stated in a recent reply that you subscribe to CQG. Therefore, if you're not a retail trader...you a hedge fund manager or a professional trader working for someone. This is probably the most important question because you then become transparent about your issue with retail trading.
2) What do you say to retail traders that use algorithms ?
This is a very important question because recently, some of the documented spoofing (e.g. London case) are being performed by folks trading from their homes as retail traders. Simply, some folks out there are actually good programmers while trading their own account.

3) Some firms that have quants and use algorithms and HFT...are losing money.
P.S. You've now changed your statement after I asked earlier if you were a retail trader. For example, you had stated recently that trading IS futile. Now you've changed it to that trading is becoming more futile for retail traders. Those are two different statements because the latter implies you are a retail trader that's not profitable.
P.S.S. Trading has always been not profitable for most since markets birth. That's common knowledge.
Edit: I was incorrect. After a quick review...you have consistently stated that trading is "becoming" more difficult for retail traders. We just don't agree on the reasons for such.
I gave an outline not too long ago about why many folks are not ready to be a retail trader in today's markets in comparison the years when retail trading was popularized. I gave further hints about why Forex is becoming more popular today with retail trading. Reasons are all connected.
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