Depending on how you build your deck, you could take it towards a more token-based approach or perhaps rely on a single powerful Soldier pumped up to massive levels
In real-life, games tend to be played amongst the same group of people week after week, hence winning often entails knowing what kind of decks they play and specifically play cards that may not be generally good but are highly effective against those specific decks
If you happen to be interested in a deck of the feline variety, Arahbo, Roar of the World may be the commander you've been looking for
Dominance of five-color goodstuff decks is more than likely due to under-performance of fast, proactive decks, multicolored power outliers, or big deltas in individual card power level than it is to abundance of fixing
The Commander 2015 decks are not worth buying retail and you should instead stick to buying the singles individually, even if that means buying the entire deck off TCGPlayer