I think the Flames are a much better team than they should be judging from the roster. There is an interesting blog on hockeybuzz at the moment that warns the fanbase from planning the parade.
Flames have a MUCH better coach and management than the Oilers but that's not exactly a ringing endorsement. I do not believe that their organization and prospect depth is enough to make a team that can consistently make the playoffs.
As a betting man I would think even with their good start Calgary misses the playoffs.
I watched the Calgary Canes game the other night, as well as bits and pieces of other games, and can not say I've been overly impressed by the Flames. They are certainly getting a bit of puck luck. They are this years Colorado Avalanche.
In short they are a much better team than I (or anyone else) thought they would be, but even if they beat the odds and make a brief playoff appearance this year I think they are a long ways off from being considered a good team.
The Oilers in my opinion just need clear out management and bring in a really good GM/coaching staff and starting next year "should" be a playoff contending team for a significant block of years.