Flying it as a brawler is quite simple: warp and/or burn as close to the enemy as possible, shoot, broadcast for reps when targeted or run local reps if lacking logistics support and flying with an active tank. As a battlecruiser, the Brutix can fit a micro jump drive, which can make it a nasty (though not especially maneuverable) high-DPS MJD tackler, or can allow a brawling fit to plan to kill anything within scram range and then MJD out of trouble.
A railgun Brutix can deal good medium-range DPS for a relatively low price. For large-scale fleets it is somewhat out-competed in this role by the Caldari Ferox, which has an additional range bonus. Lightly-tanked rail Brutixes can work well in smaller mobile gangs, with other lighter ships providing tackle and screening off enemy tacklers.