I saw it tonight, the acting is solid for the most part with Sam Rockwell giving the standout performance for me. Langella is mostly good but Sheen feels like he is playing Frost as a camp parody at times, whilst at others he imbues him with a likable underdog quality.
I liked the structure, using the talking heads documentary looking back at the events with members of both supporting teams, inter-cut with the movies glossy fly on the wall style documentary. However I felt they betrayed this with the phone call scene before the final interview scene, it was so Hollywood and unnecessary, Frost's subsequent "training montage" was just cliche.
The way Howard sets the interview segments up like a prizefight with each verbal pugilist having their own corner team, is very effective and the interview scenes are engrossing and compelling, I wish they had been longer as the behind the scenes stuff padded around them is far less interesting.
It's an average movie, well marshaled by Howard with 2 solid lead performances and a couple of really good scenes.
7.5/10