Perhaps the author of that was in a supercilious mood, or writing faster than his mind could think.
-*Most people* hail from humble origins, thus it makes sense that heroes would to. In fact, it makes less sense if the hero hails from privileged origins, as the adventures the BG series takes the protagonist on are far beneath royal standards; the 'stereotype' folk from such a background wouldn't be able to hack it (granted Anomen & Nalia in BG2 effectively break that stereotype).
-I reckon 'A devastating battle' sends most people's quiet lives 'spinning out of balance.' I know mine hasn't been the same since 9/11/01. How much more for other personal tragedies that happen to people that others would be unaware of?
-If a person is destined to make an impact, chances are they'll inevitably meet others with skills to help them on their way in some capacity or other. Meeting folk with magical & martial prowess in fantasy settings will inevitably happen to the protagonist, much like a person with ambition on Earth, if they're competent, will eventually meet folk capable of complimenting his/her own skillset in their own quest, upon knowing where to look & stuff.
-Powerful people (or at least people who show outright potential to acquire power) will inevitably draw the attention of those already in measures of power, for good or ill. Like the other points I've thus far made, how would it be a Bioware RPG Cliche, if the same exact things can & do happen in real life?
-Very rarely are evil schemes, both fantastic & on Earth, localized to one area. Thus it'd only make sense, both in fantasy & on Earth, that quests would take the protagonist beyond one location. I wouldn't limit it to only four locations either.
-Typical 'evil or sinister organizations' normally wouldn't go down without a fight, so them seeking to thwart the protagonists every effort is only to be expected. This for fantasy & RL on Earth as well.
-Most people do indeed dream when they're asleep, at least once in a while. And most people, regardless of their personal religious beliefs or agnosticism, tend to believe their dreams mean something or other.
-Most evil or sinister organizations/villains have things they're hiding (be it secret information, secret stash, another sort of secret asset; most likely varying combinations of all three), and goals that they seek to keep hidden as well. A secret & forgotten ruin could be as viable a commodity they'd seek to hide as any other thing (even in RL on Earth it can be akin to a nondescript building in an urban area).
So how are any of those things the Bioware RPG Cliche the author makes them out to be? Any of those things can & do happen in real life on Earth. If anything, it shows to me how well written their games are (or at least were, prior to their 'merger' with EA).