sparks: check this out,I had the same problem a couple of weeks ago:
http://wowmb.net/forums/showthread.php?t=10704 And that was even before they fixed Demonic Resilience,which wasn't working at the time,albeit the Felguard did more damage back then. To sum it shortly,if you respec to 0/41/0 as soon as you can,you end up with a minion without its basic abilities: Cleave,an extra attack every 6 secs,available at 50; Intercept,a stun attack,available at 52; Demonic Frenzy,builds up attack power,available at 56. Not only,you also trade all your versatility (mana efficiency,DPS output) with affliction and destruction talents and become reliant on a flawed minion: all you can do is Improved Healthfunneling it,not really fun at all. Also,thanks to Blizzard's perspective that the average warlock is level 60 and wears a Tier 3 set,the Felguard is only supposed to become "very good" from "decent" when you are heavily loaded with +spell\shadow damage gear. So,get back to your trusty VW and see you at level 56.