I'm generally healer, so I scrutinize tanks. They'll get the hearts if they do well and/or "lead" the party.
Otherwise I give commendations based on incredibly specific criteria.
- Were they friendly? Not just "hello" but do we socialize and joke around to some degree?
- Do they help out the first timers? Do they exhibit patience?
- Subligar always get commendations.
- Do they have an "amusing alias?"
- Is their name LITERALLY "Amusing Alias?"
- Anyone from my FC/LS. This actually happened once purely by random.
- Did they invent a particularly creative sob story about why they absolutely need commendations? Hey, I like being entertained!
- I once gave a commendation to a tank because he ran in yelling "For Vanadiel!" Nostalgia hearts.
Mostly, how much are you helping me enjoy the game? That's why we're all here after all, isn't it?