[NoOne]

bb/9
hr/9
whip
batters againsts slash
BABIP*

including any other rates of fundamental and basic stuff

if those are low relative to league baseline, it's a good pitcher. they each tell you something fairly fundamental about the pitcher.

my teams are usually pretty consistent, so era tells me a lot too. i know what an elite ace ERA is on my team. i know what an elite closer ERA is on my team. i don't typically look at the ERA of players on other teams though. regardless, it will have a fairly strong correlation to good pitchers. if you have ~better defenses on average, expect pitcers to have a bit lower ERA on your team, or vice versa. (relative to team defense they are coming from, of course.)

*babip is a bit different. a pitcher can have an average babip against or a bit worse babip against and it won't be consequential. it just can't be wretched. anywhere near ~average is fine. (.300ish and lower in mlb-like leagues -- a bit over? no biggie if all the other numbers look good)

i also use babip to assess the amount of luck from year to year (a good portion of luck, anyway). it's almost useless for a younger vet RP. it takes numerous years for an SP to have an accurate career babip average -- and that assumes no TCR or changes that affect babip against during that time..... so, it's quite difficult to use with RP's except in a very general way with a large range of error.

the fancy stuff like fip and ops+ and blah blah... rely on human perception and understanding on at least a portion of how these values are calculated. So, there are inevitably flaws in how they are setup or they'd have a stronger correlation than they do. nothing more needs to be said about them. the very math that supports them shows that they aren't anywhere near perfect. (probably shoudn't have included ops+ for some of that stuff, but still a 'summary' stat)

i do like ops+, because it normalizes to league. in RL i have severe doubts about normalizing for parks and other factors over time. in ootp video game, these things can be 'perfectly true', so to speak.

either way, i still like to look at the individual parts as opposed to a summary. when you know the individual parts you know what you can do to help... e.g. lots of flyball pitchers? big park, good OF defense is 'better' etc...