I like OPS but I feel like you use it too often, or misuse it at times. It's a stat that, at this point in the season, is very heavily skewed by an event such as one home run. Therefore, if someone hits a home run and then doesn't hit another one for awhile, it's obvious that his OPS is gonna drop.
It's a good stat to use at the end of seasons or with a lot of sample size, but judging a player based on fluctuations in the stat at this point in the season may not be taking advantage of its intended purpose.