Yeah I think the goliath nets an extra +2 con and +4 strength (+2 from goliath and an extra +2 when mountain raging). so really that's an extra + 1 HP/level and + 2 attack/damage.
Note that Mountain Rage increases your size category, meaning you get +8 Str, -2 Dex, +4 Con, +2 NA, and -1 attack/AC while it's up on top of your rage bonuses. Yeah, it's kinda good.
With +1 LA for free and LA buyoff ... Half-Minotaur Goliath Barbarian 1. Natively, you're Large (and count as Huge when it would benefit you). When you rage, you become Huge for real, and gain the stat adjustments. With an 18 in Str, your base Str should be around 34 or so. When you rage, you should go to 48. That's naked at level 2 (after LA buyoff). If you can stand the extra LA and waiting to buy it off, Feral Half-Minotaur Goliath pretty much rocks the house. Huge Str and Con, 2 primary claws and a secondary gore, pounce, fast healing, rend and rakes eventually. The major downside: your Dex and Int get tanked. Hard. Don't count on being smart or quick, but damn if you aren't a bruiser.