Well, see, that's not what you posted about. You were asking for people to vent about "imbalanced" and "cheesy" units that people "almost refuse" (whatever that means) to play against, and combined it with a rant where you lambasted people who run the (arguably) only good chaos heavy support choice as being "beardy" and "waac"..
Your attitude annoys a lot of people because it's common among bad players who whine when their opponents use tactics they don't know how to beat instead of learning how to play. This type of player is known as a "scrub". I don't know whether you're a scrub, but you have a lot of the same complaints that they do.
And you're wondering why you raised hackles?
You'd probably have gotten a better reception if you asked about what enemy units people find annoying or frustrating, rather than what they "almost refuse to play against".
Even though I said I wouldn't post again (I've calmed down), I just want to say, maybe I did go a little overboard and I don't want a rep as being an asshole.
In saying that LastDaysOfHumanity made me realise exactly what pissed me off so much about the OP. (So +rep for you).
1. You might have added the word 'almost', but you also included 'refused to play against', and your reason for doing so was your opponent taking a particular unit, not just spamming the shit out of that unit at the expense of all other choices.
2. You picked on CSM's, I mean seriously, there have been a number of threads lately that attack our codex one way or another and after numerous times defending the codex as 'not as bad as everyone makes out', you came along and trashed the one truly unique and all-round decent unit we have.
3. You accused people who take the unit as being 'Beardy' and/or WAAC, when to be honest, given the newer codices available, you really had loads of things to choose to hate on, but you chose us Chaos players, who lets be honest are in a bad way with our armies, with no sign of things getting better.
Anyway.
Getting back on track, and with a little modification on the original question.
Units I hate to see spammed in an army are:
In my home Codex (Chaos Space Marines)
Daemon Princes ((especially Lash)
Plague Marines
Obliterators
In other codices
Hive Guard
Baal Predators
Blood Angels Assault Marines withouth Jet Packs
Blood Angels Razorbacks
Tzeentch Chariots in the Daemon Codex
Basically any unit where people have determined that is the only viable unit in the entire slot such as Fast Attack, Heavy Support etc, and then proceed to spam it.
So like I said, sorry about being a dick, but the way you posed this topic did/does piss me off.