First of, what do you mean with crappy RT combat? That's the exact opposite of the popular opinion of this game...
Well, if the popular opinion is to be believed, Oblivion is the best game ever and KOTOR is the pinnacle of turn-based combat.
... and sure, there might be some merit to your claim, but at least add some basic argumentation to that claim. Or are you on of those geniuses who thinks that combat is bad when it is not turn-based?
I don't. As for throwing in some arguments, the topic has been discussed to death years ago (the consensus was that the Infinity Engine combat sucked in general and in BG in particular) and doing it all over again is simply boring. No offense.
Here is one BG thread that comes to mind (although I don't recall if combat was mentioned there)
http://www.rpgcodex.net/forums/index.php?threads/why-was-bg2-subpar.1935/
Edit: Here is another:
http://www.rpgcodex.net/forums/index.php?threads/what-is-it-about-bioware.1587/#post-13135
Saint Proverbius: "Instead of something that pushed forward, BG through the use of the popular D&D license, dragged the CRPG genre kicking and screaming back from the technical improvements of Fallout straight back to the days when CRPGs were just combat games. Then it further dumbed down the genre with passive combat where the user simply has to watch the combat and make sure everything is going okay rather than any real involvement."
^ Now that was the popular opinion on the Codex back in the day.
Secondly, what is wrong with linear games? There's a shit-ton of great games that are all linear, in fact, most great games are linear. There are some games which are truly open ended, which generally falls into the sand box category, and some of them are great, but there is always the "because it is open ended" attached to that sentence. Thirdly, why the hell is it essential to have an active choice? It's a game, not the real life. We play games to escape reality not to live while we live, there's nothing inherently wrong with being shoehorned into specific roles, especially not for people who likes to have a fun time, but don't have any fantasy, like me.
Not even sure where to start here.
First, linear games are less interesting (at least for me) because you don't play a role - you follow a preordained, set in stone path. Replaying a linear game produces an identical experience. Now, I know that some "storyfags" prefer it, arguing that the best story is a linear story and they don't have time to replay games anyway, so let's say it's subjective.
Second, you're confusing different concepts. Non-linear and open-ended are two different things. Having an "active choice" doesn't mean that a fantasy game suddenly becomes real life. It means making decisions within that fantasy world, unless it's too stressful for you. Playing a specific role in linear games? You don't. No more than you play a role of a brave and indestructible marine in Doom.
Most great games are linear? Care to be more specific?
Fourthly, your summary: "farmboy/girl discovers that he/she is special and has special powers" is incredibly stupid. It might seem clever to you, and it would have been, if it wasn't for the fact that this kind of deconstruction can be done for every single story that was ever fucking crafted.
Wasn't it already addresses above?
Fallout has a dumb "Fed-EX fetch the waterchip" plot, PS:T has a dumb "amnesia plot with some loser trying to string together his story and fighting a retard in a fortress". In fact, amnesia and plotting together your past, is only beaten in popularity as a basic plot device by "you are good, it is evil, kill it" or "go and get the thing". The quality of a story does not lie in the basic premise of the story, but in the details of its writing.
Once again, you're confusing things. Fallout is not about fetching a waterchip. It's a plot device to send you into the big new world.
Fiftly: " You fight enemies matching your level, level up, move to the next pretty map, fight tougher enemies, level up, move to the next map," Yeah? That's what you do in every fucking RPG. That's how an RPG work.
Only the linear games that you like so much.