Ashaman X wrote...
My adventure with BioWare games started with NWN1, and I own everything since with the exception of Jade Empire. While I have noticed that the start of the stories generally are the same, it feels different enough in every game that I don't care. The story usually grabs me in the first few minutes and doesn't let go. ME and DA feel totally different to me, despite sharing the same sort of minor plot elements.
BioWare games have lots of common tropes--more than was pointed out on the chart. The BioWare Twist (patent pending), the slavery sidequest, the Big Bad, the "sleep with me before we all die" (averted in a few games), and many others. There are a lot of plot elements and character types recycled. When it comes to the use of stock tropes, BioWare does it as often as any game developer.
But I'd like to point out your word choice here. You said the games feel different. That's where BioWare shines--trope implementation. There's a lot of recycled stuff, but they have a drastically different FEEL. An analogy would be making cookies. They're all cookies, with the same basic ingredients, but snickerdoodles have a different feel to them than, say, Russian Tea Cookies

They can take the same essential plot element--your home being destroyed--in BG, Jade Empire, NWN, and some iterations of ME's Shepard backstory, and make them all feel completely different. I never notice the tropes while I'm playing, and I certainly don't pick them apart like I do now. What I notice is an immersive world, fun characters, and compelling lore that piques my interest. It's only in hindsight that I go back and pick through the plot elements.