As one who grew up in Kansas City, I found it exciting, nerve-wracking, and overall one of the most exciting Super Bowls ever. SF played well enough to win and so did KC. Neither was dominant, both had mistakes from key players (CMC fumble, Pacheco fumble, Mahomes pick, blocked XP), and both struggled to get the ball in the end zone on key drives.
I understand Shanahan's decision to take the ball first in overtime in case both teams score evenly, you get the chance to kick a field goal for the win. I also understand why the Chiefs would want to kick first in overtime. In the end, they both got what they wanted regardless of the coin toss, so it came down to who could execute in OT.
I do not think the Chiefs were the best team in the league this year, but they beat some of the best teams en route to the title. "You gotta beat the best to be the best." With that in mind, any time 15 is on the field, there's a chance.