"Rogue Trader" then, for it's many flaws, is at least partially successful, because it makes clear the central principles of what Leeson was doing - making a double bet on the market going only in one direction. Having worked on London's futures exchange, I can't really be objective. I laughed out loud many times at the actors' and extras' bad hand-signals, the unrealistic dialogue in relation to price and size etc. "Real" market-speak often takes for granted that both parties understand alot more than needs to be said, thus leaves alot out. But of course that makes for bad cinema, so one can't grumble too much.
The cast is generally pretty good, McGregor acting his socks off as always. The main problem is that the script and direction are, from the get-go, just totally OBVIOUS. By this I mean that no visual or audio cliché is left unused. For example, every Barings office in London seems to have a plum view of St. Paul's Cathedral, just in case we forget where they are. And if these scenes can be accompanied by some chamber music, to remind us of the history and upperclass pedigree, then they will be. The reckless young traders, by contrast, are followed around by a largely anachronistic soundtrack of dance music and Britpop. When Leeson arrives in Asia for the first time, we hear Kula Shaker! Please! Perhaps a different, less conventional style of direction might have improved matters...
It's interesting that many people have commented along the lines of "Leeson only does what I'd do in that situation, trying to make things better". Since it's based on his book, the film unsurprisingly tries to make Leeson look... well, if not good, exactly, then at least not like a total idiot. I can't sympathize entirely, because "NEVER double up" and "a small loser is better than a blow out" are amongst the first things you learn down there. But even if only one tenth of all this is true, it's still truly stunning that Barings London didn't know what was going on, and accepted his story unchecked for so long... If they were that incompetent, they deserved to go bust.
Ultimately, "Rogue Trader" is neither a great movie nor a terrible one. As far as finance-films go, it rises majestically above the plain awfulness of "Dealers" or "Limit Up", but is still less informative than what is still the best market movie, "Trading Places". But who knows, maybe "I have just lost 50 million quid!" will enter traders' vocabulary in a few years, just as "Turn those machines back on!" already has. As a film, it's an entertaining diversion, and an interesting footnote to the headlines.