Mass Effect 3 Ending question [please NO spoilers]

Hey ppl,
I'm about to finish ME2 and gonna buy ME3. Thing is, I've heard of an argument between community and BioWare as it comes to final of ME3. Some DLCs there were or will be released and will "fix" it. I don't know details and I don't want to know because I want to know plot on my own. So, question is, this additional finals are optional in box version? Can I choose to play in pure, original version without this new final bs? I mean, I want to experience the game like studio made it, not like gamers want to have it.
I'm about to finish ME2 and gonna buy ME3. Thing is, I've heard of an argument between community and BioWare as it comes to final of ME3. Some DLCs there were or will be released and will "fix" it. I don't know details and I don't want to know because I want to know plot on my own. So, question is, this additional finals are optional in box version? Can I choose to play in pure, original version without this new final bs? I mean, I want to experience the game like studio made it, not like gamers want to have it.