Yes, agreed - a tv series would allow the episodic feel of D&D to unfold. A film would work well with one of the more epic stories, like Dragonlance Chronicles. At the very least, I'd prefer that a TV series start more from its sword and sorcery roots, and only gradually involve more epic fantasy tones.
MCU is a "dangerous" influence and role model. On one hand, I agree: the formula has worked really well. I personally eventually experienced MCU fatigue, but there's no denying that they're well-wrought and their commercial success means the proof is in the pudding. While the films are geared towards younger folks, they have broad appeal - in a similar way to, but even more so than, Pixar films. Perhaps most of all, they found a way to incorporate humor without overly diminishing the seriousness and epic quality.
But the problem is that it may not translate well to other venues, and is also probably more difficult to capture than dozens of MCU films imply. The humor is very contemporary America; that sort of humor might not work well in a fantasy world, or at least reduce any atmospheric qualities, and atmosphere is hugely important in fantasy. The LotR films successfully incorporated some humor, but it was light and felt organic to the world itself (e.g. hobbits being hobbits).
Here's an example of what I'm talking about, as far as "real world jokes" intruding upon a fantasy venue: Poe's joke about waiting on hold in The Last Jedi. Not only was the joke rather flat, it was based upon things from our world and broke the sense of the Star Wars universe being its own thing.
So my worry would be that a TV show would include a bunch of "nerd jokes" - wink-winks to the gamers and such - and try too hard to emulate the campy and fun nature of MCU, while at the same time diminishing fantasy atmosphere.