Absolutely. Any strategy (including our straddles) can produce some occasional big winners. What matters is what is the overall return and what is the risk.
Our straddle strategy is producing 5% average return including the losers, and it rarely loses more than 7-10% with 80% winning ratio. Can you say the same about any directional trading strategy?
Since, you have an 80% win rate and only a 5% return on average, what happens when you have a couple of large losses because a straddle takes two positions a once? So, it costs you more for a single trade compared to a directional options trade? Wouldn't a couple of large losses wipe out any small gains you made? It is not the winning percentage that matters but, your edge. What is your win/loss ratio? How large are your wins vs how large are your losses? If you have a 2/1 win loss ratio and say 40-60% winning percentage on directional option trades, you should be fine.