I've never played Magic, so I can't say for certain what sort of errors they have or how often. I have heard that they generate a decent amount of errata though. Whatever. Magic is almost a thing unto itself. FFG is mainly a boardgame company so that's probably the closest comparison.
For example, a couple of games I've been following lately...
War of the Ring is a reprint with updated rules for better balance. Most everything is going well, but a few people have reported missing models in their box. And some people have claimed that wording is unclear in a couple of rules. Frankly, this is impossible to prevent, SOMEONE will always say your wording is unclear no matter how you write it, because someone is always trying to bend the text to say something different than what it really does. But one or two of them have a legitimate point which may be updated in the next print run.
A Few Acres of Snow is a wargame using a deckbuilding mechanic something like Dominion, except you get the cards primarily by conquering regions on the map. There's been a big fuss over a supposedly near-unbeatable strategy for the British side involving a specific opening and keeping your deck as small as possible to cycle a specific card. The designer of the game just put out some errata/changes to specifically address this issue. The game worked really well in general, and is otherwise highly rated, but had a problem in this one degenerate case. Sloppy playtesting? Players not playing the game in the spirit it was intended? You make the call.
I could name others, but mainly the "complaints" are just people wanting games to be other than what they are. Flash Point (firefighting game) doesn't include rules for tracking the players oxygen supply. It's not intended as a simulation, it's supposed to be a fun quick game. Elder Sign (another FFG title) is too easy, there should be difficulty levels or rules for ramping up the difficulty. OK, possibly legit, but it's not that hard to adjust it by simply starting with some Doom tokens in play - basically giving less time to deal with the Great Old One before they show up.
Unclear rules = misprints in most people's minds, and half the time "unclear" just means that it was perfectly clear already and they were trying to twist what it said into something else. Or if nothing is unclear, they'll complain about how the rules are arranged, it should have been explained in a different order or they had to flip around looking for the answer. Every game has questions, complaints, and so forth. As long as they're minor or the company deals with them well it doesn't really bother me.
Back to Clarney... It's true that if you stick with the Core set or only pick up minimal expansions that he won't fade into insignificance, it's not really fair to assume that most players will want to collect more of the game. Personally, I feel like he should have been errataed back to Miskatonic and replacement cards made available. Maybe if it had happened today it would have gone that way, I think FFG has learned something about better service since then, but it's too late to change it at this late date. And that's why if someone wanted to play him as Miskatonic I wouldn't object to it since I know it was originally a misprint.