Dislike (i'm in rant mode and this thread came up right in the midst of it - just a pre warning):
Pretty much everything that's already been said applies to my gym, too. I've especially got a growing disliking for the people and atmosphere which i'll expand on below.
The standard... For a while there we had a couple of really good lifters who would put everyone to shame. It was great. You got stronger just watching them lift. Now though it just seems to be mostly idiots. There's a handfull of people who train properly but a growing number of complete idiots. A small influx of guys that tell you how much they USED to lift or how much they can NORMALLY lift but just happen to be recovering from - insert common illness - .... I miss the days when I blatantly blanked everyone. I actualy avoided speaking to anyone for about 3 years. I miss this!
How many times have you came across someone impressively strong who randomly tells people how much they can lift? Honestly i've met no one like this. I now conclude that anyone who tells me they can lift "X" lbs without being asked is most likely full of crap.
The work rate/effort. I reckon 98% of lifters in my gym just pi$$ around doing random lifts with random weight for random reps for how ever many sets they feel like. As long as they don't break a sweat or strain in any kind of way they seem happy. They train with the same intensity required to take a hot bath. Not only that but it seems to be contagious.... These are the people who will bother you between sets. Problems can arise, too, when you think you're doing well because you look at others and see what they are doing.
Aspiring to be better than the people around you can still lead to no where if you train in a typical commercial gym. Don't lose the

you feel towards those around you. Otherwise, you'll start comparing yourself to them. This is a mistake because you can be miles better, stronger, faster, bigger, and still, at the end of the day, be crap.
This can sound harsh but honestly I think it's quite accurate. In every commercial gym i've trained in there seems to only be a small handful of lifters who actually train with any effort. How many people do you see barely able to walk after training legs? Or who actually NEED to sit down between sets and catch their breath. Or looks light on their feet because their blood pressure is still sky high from grinding out a heavy lift? What about a "genuine" grunt. That sounds silly but it's not. You hear grunting all the time but you don't see any straining. Why do they grunt, then? It's completely stupid.
I'm stopping before I throw my laptop off the wall
Deep breath....count back from 10.....