I played Villains before Going Rogue. To tell you the truth, the only pet I have is the Disruptor from Mace Mastery with my Crab because he already has 2 more pet powers.
I really tried to keep them with my old Brute and all pets just died too easily. And the damage they bring is low.
Mu pet is one of the "better" patron pets and mostly because it stays at range more often (they still run in sometimes).
However, if you just want more dps, just take Assault leadership if you haven't. You'll get more use out of Assault than patron pet that dies quickly and has ridiculous long recharge (and has duration limit).
For theme purpose, Mu is not bad, although I believe only the Mu pet from Dominator can heal? I haven't used patron pet for years. Can't remember.
What's left is to normalize all Assassin Strikes and improve Stalker's old sets (Claw, MA and EM)! You don't need to bring back the missing PbAoE attack. You just need to make the existing ones better! For example, make Slice a WIDER and LONGER cone.
Depends on how tough you normally run. If you normally run +8, then the Mu almost certainly won't last long, if you tend to run smaller sizes, you might find him helpful, he certainly won't be a game changer though.
Mostly I have him to get the 6.25% recharge and the 3.13% ranged defense from expedient reinforcement.
Also, have you considered conserve power? I find it more useful than powersink, but you could always take both.
Draggynn on Virtue: lvl 50 Storm/Psi, 1389 badges
Draggynn's Guide to Storm Summoning(Gale-Tornado, updated 6/25/2011)
Avatar by Wassy full reference here
I have an ice/storm/elec corr and i only find i use charged armor and power sink, i never get into melee range to use thunder strike. I dont really want shocking bolt so i thought to go with Mu. Id have power sink, charged armor, and Mu adept.
Now my questions are these: Is Mu Adept worth getting? Is it any good? Does it have good dmg?