Braniac seemed too much like a (poor) attempt at cross-humour. Now, take this with a big grain of salt, but generally British jokes tend to be language based humour while American jokes tend to be environmentally based humour.
So, British humour excels at things like puns, innuendo, etc... Are You Being Served is a *perfect* example of a show where the straight delivery of naughty lines made up the vast majority of the humour. Allo Allo and Dad's Army are other good examples.
American humour excels at things like slap-stick, goofy looks, fight scenes and romantic comedy. The delivery of the lines is important, but the lines per se mean exactly what they appear to, and it is the
situation which makes it funny. Everyone Loves Raymond and Sienfeld are a good example of this. And even though Fraiser has puns in it, the vast majority of the humour is this kind of stare & giggle variety.
Now, there are exceptions to these rules, but I find that most of what people consider "best of" humour for each country tends to fit into these patterns. Braniac is trying to recreate the "HORAH" of Myth Busters (lets not kid ourselves here), but with script writers who try to come up with clever puns instead of a couple of guys overjoyed they found someone to pay them to blow ---steaming pile of meadow muffin--- up. That kind of mixing is
exceptionally difficult, and poor knock-offs don't tend to fly in the border colonies like Australia which get to see the best of both sides, and don't have to put up with this mish-mash nonsense.