With the new Hellcat Waistguard belt in addition to the buffs the M6 set has gotten, this is probably the second strongest solo DH build after LoN FoK right now. Compared to the dominant builds of the past few seasons, this is more a hit-and-run playstyle again and can be a refreshing alternative without giving up a lot (it’s maybe 1 tier or so weaker).
Since the Marauder build is fairly squishy, you should go with as much defense as you can get while trying to maintain a good damage output. You don’t need Sentry damage on your items, you can even roll it off your quiver if you get a really good roll. Try to get some area damage (preferably on shoulders, quiver, rings), stack crit chance / damage and elemental damage wherever possible, and roll CDR on 3 items (preferably shoulders, gloves, quiver). Fill the rest with defense, and perhaps attack speed on your weapon.
Optimal item rolls: http://www.d3planner.com/686921472
Don’t care too much about your Sentries, they are only there to buff you and slow monsters. Just set them up so that you can cover most of the area with the slow effect, and only look at your own positioning when nuking. Try to stay on the move, start spamming Cluster Bombs 2-3sec before Convention hits fire, and stop again 1-2sec before it hits lightning. Use the rest of the time to pull more monsters and regenerate hatred with your generator, then repeat. Keep up Vengeance and use your Companions before a nuke (wolf), or when you need some additional hatred (bat), or when you are in danger (boar taunt), it’s quite a flexible skill. Other than that, try to stay away from walls, obstacles or edges where grenades can fall off, as the bouncing grenades from your belt will disappear there.
There’s a couple variations of this build that you can play around with. If you feel like you aredying too much, it might be a good idea to go with Vengance - Dark Heart, this should help inexperienced players espcially. If you want to play this build in groups as a dps DH, you can consider to run with Endless Walk + SoJ, and perhaps also with Reaper’s Wraps if you have a Barb spawning globes for you. Using EW is also a possibility in solo, however you will lose some precious damage from that, because you will probably want to couple it with an Elusive Ring instead. Instead of Sentry – Polar Station, you can consider running with Sentry – Guardian Turret and switching to Entangling Shot – Justice is Served as your generator.
Consider watching the video for more info, I also go over some maps, mob types, rift guardians, pylons, how to deal damage, etc.