Well, it's not just disappointment, it's TERRIBLE design. If I can AD out of hitstun and avoid being hit again, there's a design problem. If I can retaliate OUT OF hitstun, as soon as I'm hit, there's a design problem. If I can live at an upwards of 190%-200% and I'm Captain Falcon or someone light as hell, there's a problem. If PS'ing saves me from being KO'd, there's a design problem. If I can't let go of the ledge as soon as I grab onto it, there's a design problem. If I can't ****ing ledgehop onto the stage with Ganondorf, there's a design problem. If I suffer a stupid special lag by just using my Up B to grab the ledge and when I ledgehop on and get lag from my landing, there's a design problem.
If there are no true spikes, there's a design problem.
vanilla Brawl has so many problems with it, it's almost as if the only true way you can get a kick out of it is if one of the design problems causes something funny to happen. Or, you're playing as MK or Snake and don't suffer these terrible problems because they don't effect you.