The DLCs aren't all that bad imo. Mewtwo I got as a Club Nintendo promo, so free. He is fresh and pretty strong, just a bit too light for suiting. I personally love using Lucas. Lucas has one of the best air games ever, and his attacks have a lot of range. Roy also seems to have greatly improved from Melee. He is certainly way better than Marth and Lucina, and he is a lot stronger too, having his power come from the base of the sword. Ryu is just strong. Ryu has a lot of moves and sound effects that are inspired from street fighter, plus all the special commands he uses are amazing as well, which is probably why he costs the most. Mewtwo was probably to test DLC functionality. Lucas was added probably because he was popular in brawl. Roy was added probably for the fun of it. Ryu required lots of licensing agreements and what not, so him costing more and coming with a stage makes sense.