Yes,
DE are still viable, and getting a new codex within the next year or two from what we hear. The abundance of Dark Lances/blasters and disentegrators makes me very happy

Shredders are awful
btw. Splinter cannons have their moments.
Wych Cults cannot have Haemmies, talos, or grotes, but Sybarites hanging around with the Warrior squads can tote the portals.
Raider Rush style is pretty limited and has died out in larger games due to the entanglement rules when a raider gets shot down. That is why most have migrated to the portal army. I use one most of the time. Now, that does not mean you have to use the portal though, you could always choose not to.
Tooled up lords, lots of warriors mostly sniper squads with 2
DL's, Haemmies especially with the acid template, wyches, the occasional warp beast pack, Ravagers, and Talos out of portals are all good to use. RJB's with 2 blasters are good for tank hunting those indirect firers, but that lack in assault.
The trick with necrons is to assault and contact atleast two squads. When the teleport out, they are all bunched up for a disentegrator shot, normally you could get a fair chunk under the models. A tooled up lord + grotesques clears out Necrons if played right. Ignore any monoliths unless you have a good deal of luck, or have a goblet of spite and some haywire grenades.
I also play mandrakes, they are fun to use, and help in assaults where needed. They also tear up T3 units, but lack in taking down anything tougher especially something like a Walker that can lock them up forever.
As stated, Hellions and Scourges are not worth the points, but Hellions look great. Giving the board to a haemmie or lord is not a bad idea, or bikes for that matter.
Makes sure you get the 2nd edition mark on the Codex, and you will be set.