Rams are benefitting from feasting on weak teams in their division, and other weak opponents accounts for 6 of their wins (Niners, Cards (twice), Colts, Giants, Texans). The only playoff teams they've beaten are the Saints, and the Jags. I think the Rams have a good defense and are surprising people but don't look like a SB contender to me. When they face playoff caliber teams they lose.
I like the Eagles, I think I'm a bit of a homer on this one though. Wentz has stepped his game up and is carrying the team by playing at a near elite level. If he can maintain that level of play through the playoffs they will be tough to beat.
Vikes are one of those good all-around teams but seem to lack a real stud in any position.
You could say the same thing about the Eagles you said about the Rams. The only playoff team they've beaten is the Panthers, and they've lost the other 2 games they've played against playoff teams (Chiefs and Seahawks). Panthers and Seahawks are the only teams above .500 they've played. In fact, they've had the easiest SOS in the entire NFL.
Whereas the Vikings have beaten 5 of the top 9 teams in the conference (6 if they win Sunday). They're not winning big, or flashy, but they're getting the job done against the best teams in the conference.