Maybe it's different by you.
Around here the place is slammed for the first three weeks in January, then tapers off the rest of the year. The line on "Bagel Sunday" and "Pizza Monday" gives off Golden Corral vibes too.
You have three distinct groups... the geriatrics, the slobs and the poors.
If you go to planet fitness at 5:30am it's not too bad. That's when you'll find the most serious guys that are pinching pennies. Go during your lunch break and you'll run into the geriatrics. Not a bad bunch. In the evenings, the sloppy folks come out. Mostly the recently divorced and/or gastric bypass crowd.
Any hotties walking around are probably jail bait.
Trainers are a little limp wristed.
Sketchy homeless types get a membership to shower there.
IMO, not worth it.