I think orks preform better at higher points levels,also you're going to see nasty stuff no matter the size of the game. The detachment of Formations in the Gazgull book is quite strong, but it can be heavy on points. Once you take the core (whole bunch of boys in trucks). Then, add in the council of Waaagh, which gets you Gazgul (and two more free warlord traits for him), and he's then Waaaghing every turn and has a 2+ inv the whole game.
At 1850pts, you can then add in some sort of axillary choice (maybe tank bustas), or drop trucks and upgrades on the ork boys mobs and add in the bully boys.
One more thing, is that there is a character from forgeworld, which gets you a highly discounted stompa, great for evening the field. Fill it with mec boys, and they'll repair damage to it every turn. You'll need to run a combined arms detachment for that though.