Yes, they are a threat. In fact, I would rank them as probably the 3rd or 4th best team right now.
I would probably rank the NFC as follows.
1. Giants
2. Cowboys
3. Vikes
4. Bucs
5. Saints
6. Washington
7. Philly
8. Cards
9. Seattle
10. Packers
Now, some of these teams are real close and depending on an addition here or there, they could slide one way or the other. Also, some could improve just depending on how much improvement is shown by the starting QBs. Vikes, Skinz, Cards and Packers all fit into that catagory IMO. If any of those QBs figure it out, those teams could be dramatically improved.
IMO, Vikings may have the 3rd most talent in the NFL right now, behind San Diego and us. Seriously, they have a lot of talent on that team and Jackson did imporve pretty dramatically over the 2nd half of the season. Over the last 7 games, his QBRT was something like 90. His Comp% was 67.8. His average passing yards over the last 7 games was only 187 per but, if you include his rushing totals, that number improves to 215 per game. His TD/Int ratio was even. 9 and 9. He needs to improve here but with more experience, he will. There backup QBs Bollinger and I believe they may have just signed Ferotte. McKinney needs to play better and I think they need another Guard but there OL should be better this year. They play in the NFC North, which means that unless Green Bay can put it together with Rodgers at QB, they basically have 6 gimmie games in division. They really only have 5 tough games on the schedule, IMO. They have Indy@home, NO on the road, TB on the road, Jax on the road and the Giants@ home. I view them as a very serious threat.