Reflect doing minicrits
Direct hit minicrit airshots
Random Crits in pubs.
casual (go back to old quick play and add a indicator of how long is left of the map) so you dont join when it is 1 min left
ingame comp
inconsistant rampsurfs in jumpmaps
that wierd waterjump on jump jurf
unlocks that takes less skills to use than to play against (old base jumper)
waiting 15 seconds at the start of every round in casual
ground randomly eating rockets
the fact that there is no ingame resources to teach people the basics to every class
medics that do not buff demos/sollys in spawn at the start of the round.
wierd melee hitdetection
rampbugs in surfing
the fact that valve think it is better to make one big update every 1.5 years instead of making many small updated more often where they only change one or two weapons at a time.
Demo sticky nerf made airpogo harder
Machina fully charged bodyshots on medics hiding behind teammates that would be impossible to hit wit default
the idea that if can aim in pubs and do not try to miss on purpose you are a shitty tryhard
being called a hacker, I am not even close to how jukebox and sheep played at i49
watching people take fall damage when it is not needed
people in pubs that think having a medibeam opperated in to their ass makes them good
the list is probably longer but these are the one on the top of my head