playing ogres is very vaguely like playing deathwing. you have a few stong units of a few individuals who will hit hard but cannot stay long in combat (even though they are very durable) due to sheer lack of numbers.
in game, ogres rely on basic bull units to do the mainstay of the fighting. bulls are numerous enough (for ogres) that you can take multiple sizable units. offshoots of the ogres deal with more specialized roles, like ironguts for extremely heavy hitting and leadbelchers for ranged support. other units like yhettis and gorgers are very powerful as well, but very few in numbers. gnoblars can compensate for this and can add their ranks to the bonus for combat res when fighting alongside ogre units, which is a very powerful combination. ogre characters are some of the most resiliant in the game. ogres are universally fast, cause fear (and so are immune to it, ie: good against undead) and hard hitting.
as far as fluff goes, ogres are a bunch of giant mongolians hanging around near the chaos dwarfs (basically the european part of russia) who kill pretty much anyone and anything they can find, enslave giants along the way, and offer themselves as mercenaries all over the world. they worhsip a giant mouth in the ground called the great maw (saarlac pit x100), which they throw stuff into to sate its hunger.
not many people around here play them, and so its an army you can feel like an individual using.