So ive noticed that lots of people on here like to say that the dragonborn is up there with some of the most powerful people in tamriel. Id like to ask, why?
From my understanding, the Dragonborn is no different then the entire septim bloodline. The only difference is that dragons are around now. IF dragons were around during the oblivion crisis, Martin septim could easily kill a dragon and svck his soul and go learn a dragonshout.

In fact, if dragons appeared any time in history while any of the septims were still alive, any septim could have svcked a dragon's soul and learned a shout. So from my point of view, the dragonborn is just a normal person (well as normal as any septim is). But we all know that uriel septim wasnt a badass demi god that could fight and kill gods (which some people like to claim that the dragonborn in skyrim can do)

In my mind, The dragonborn isnt any stronger/better of a hero then the guy from arena or the guy from daggerfall, (or even the champion of cyrodil - BEFORE he becomes a daedric prince)
It seems to me that the nerevarine is the only hero in the last few games that actually achieves immortality and is up there in power comparible to divines or daedra.
(i dont consider sheogorath to be the champion of cyrodil because the champion loses his/her entire identity - race, six etc - and gets a personality of a daedric prince that was around long before the CoC was. So pretty much gets taken over by a daedra personality)

Anyway, what do you guys think on this? Do you think the dragonborn is the all powerful being that everyone claims? Or is he just another septim?

Well he/she is not "just another Septim," because the Dragonborn isn't a Septim at all. The Septim line was wiped out, it no longer exists.

What being "Dragonborn" meant specifically to the Septim Emperors - especially those that never had the opportunity, or demonstrated the ability, to absorb dragon souls and use the Thu'um - seems to be http://www.uesp.net/wiki/Skyrim:The_Book_of_the_Dragonborn even within the game world. Whether or not they could have done those things, there's no way to know. Whether or not our Dovahkiin could do all the things they *did* do by virtue of being "Dragonborn" is something we may never know either. Yes it's the "blessing of Akatosh" one way or the other, but does that always mean the same thing every time? Is it bestowed at birth or only when an individual meets certain criteria within the context of a particular situation? Does it always manifest itself in the same way for every recipient, regardless of circumstance?