Shield Defense is a fine set for general content because it focuses on positional defense, which works against almost all attacks. Shield Defense can also reach 90% or more defense debuff resistance on Scrappers and Brutes.
Dark Melee/Shield Defense is much better on Scrappers than Brutes because the damage buffs add a lot more to the higher base damage that Scrappers get. I ran some numbers in another DM/SD post and found that a Brute at 75% Fury does less damage than a Scrapper in every scenario for DM/SD. If you are set on keeping the Brute, it will work just fine, but Scrappers have more advantages with that combination, in my opinion.
Your build is fine for someone on a budget. I would make some changes though.
Drop Assault. The 10.5% damage bonus is a drop in the bucket for DM/SD, especially on a Brute. You can get 55% damage bonus from AAO (with 10 targets in range), over 56% from Soul Drain, 150% from Fury (reliably), and about 95% from slotting. An extra 10% damage bonus does very little when you already have 350% or more damage bonus.
Instead of Assault, pick up Grant Cover for the defense debuff resistance. While running that and double-stacking Active Defense, you can get about 70% DDR. Reaching 90% requires Membranes in Active Defense.
Drop the Kinetic Combat set out of Smite. It is expensive for the defense gained. To make up for that lost defense, move the endurance reduction from Assault to Dark Consumption to complete the Multi-Strike set.
Put your best set (and procs) in Smite because it is the attack you will use most often. This means you move the Touch of Death set to Smite. You should be using the Smite->MG->Smite->Siphon Life attack chain for single targets if you have the recharge for it.
A 5th slot to fill in a Crushing Impact set (instead of Kinetic Combat) for the 5% recharge bonus can be pulled out of Shield Charge.
Don't bother enhancing Phalanx Fighting's defense bonus. It doesn't do anything when no allies are in range. I would put a Kismet 6% to-hit bonus in there instead.
I have an old toon, DM/SD, that I might want to bring back to life and IO him out. I was wondering two things. Are these powersets good for all around content? TF's, Trials, maybe a little bit of farming. And my second question is, is this build good?
Thanks for your help!