The Ravens aren't unbeatable, although unfortunately they appear to be playing at their peak right now.
They lost to Kansas City & Cleveland earlier in the season, they had blow out wins against Miami & Houston. They beat up Cincinnati pretty bad in one game and barely got around them in another. They handily beat Seattle & New England, but had very close games against Arizona & Pittsburgh. They are currently on a roll with 6 straight victories, the last 4 by wide margins, but they may also be looking forward to the game following ours against the 49'ers. No doubt they will be coming in confident, but as I mentioned earlier, this could become a trap game for them if they arrive over-confident.
We play our 'A' game, ... we win. jmo.