I find with like 3 powerstrike, just runnign with a two handed swords works wonders, just raise it to the overhead swing, then just your opponent. Most likely, he will go for a block, but when you get fairly close he drops it for an attack, then WHAM! I hit the bastard uside the head.
Or block, then kick, then hit if he goes for the attack first.... Usually, if you can survive the first 6 or 7 opponents that spawn with you, you are good if you take out the new guy that spawns, immediately. Then, when there are like 15 oppenents left, a whole bunch spawn at once, so try and stay away from everyone so they don't all come fight you. Sometimes, when there are 4 guys that have beaten down their opponent, will suddenly become 'allied' and go after you, which sucks. But, with a little luck, only 1 or 2 guys will be left after everyone slugs it out in the 'finals' round (mostly champion fighters and 1 or 2 veteran fighters), which should be even enough for you to win.
So....Use the friggin two hander!