Well, technically Space Wolves are on the other side of the fine line. They are as good as normal marines in shooting (although have no heavy options in return for more special, not a big hardship) but are better in combat too. For free (well, actually cheaper!).
Technically, Haravikk could have phrased it slightly better by talking about Jack of All Trades, Master of None. Which is what a dread with one ranged weapon and one melee weapon is - it's mediocre at range and mediocre in combat (although that combat massively depends on who you're fighting, to be fair. Against some targets, dreads are nightmares, but against others they're short-term tarpits or even just puppy-chow). Whereas Space Wolves are Masters of All fricking Trades (for the price, that is).