On the contrary! I work on the IE team and we're playing along nicely. Google just joined us on the ORTC spec, which Chrome considers to be essentially Web RTC 1.1.
http://www.cnet.com/news/reconciliation-draws-closer-for-sky...
For IE implementation status, follow along here: http://status.modern.ie/webrtcobjectrtcapi
and check out our ORTC prototype: http://html5labs.interoperabilitybridges.com/prototypes/obje...
Don't kid yourself. Sometimes it's the IE team that refuses to play along. Example: WebRTC.
Overall I feel that the cooperation between vendors on standards is quite good. but you can't expect all these mega corps to agree on everything all the time.