Yeah, no reason to hate invasive, bloated DRM-laden adware that has to be beaten down with a stick to keep it from trying to "enhance" your gaming "experience" by spamming "push content", taking over updates, trying to control install and save locations, etc, all while mining your data in order to sell it off to the world.
Let's see:
"invasive" - perhaps in a general, market-wide sense (i.e. many game publishers choose to distribute through Steam, thus requiring its installation), but it is only installed with user's consent and without resorting to underhanded tactics like, say, SecuROM rootkit DRM. Definitely not comparable to invasive malware and such.
"bloated" - fair. The client is larger than it needs to be - it would be nice if a lean, minimalistic version of Steam was available as an option.
"DRM-laden" - as far as I know, Steam does not promote its DRM, it is entirely up to the publisher to decide whether to use it or not. Paradox has spoken out against DRM on many occasions, and Steam versions of Paradox games are DRM-free.
"adware" - Steam client, when run, may show popup ads which can be easily disabled in the client settings. That's the extent of it - again, in no way comparable to malware.
"has to be beaten down with a stick" - I prefer using mouse and keyboard to adjust software settings.
"to keep it from trying to "enhance" your gaming "experience" by spamming "push content", taking over updates" - I can see why you may not want that, but to be fair you need to consider that for many (probably most) people patching software is simply busywork that they are happy to be able to automate. That is to say, if you are trying to convince people that Steam is something to hate, this argument is very likely to backfire.
"trying to control install and save locations" - fair point about install locations - even with the ability to set up multiple game library locations, Steam is still quite clumsy in this regard. Not sure what you mean about saves - at least for Paradox games, saves are located in their usual place, Steam version or not.
"all while mining your data in order to sell it off to the world" - that would be in violation of their privacy policy - you'll need evidence to support this claim.