I've toyed with 13th company some. here is what I have learned from my limited experience.
They can be an incredibly fun army to play with, but only if both you and your opponent are okay with loosing tons of models at once time. 13th company kills and are killed very quickly.
if you decide to make wolfen count as troops you are going to be EXTREMELY limited in your shooting faze. Also, the army will be more hit or miss. Some armies you will slaughter by the second turn, others you will be hard-pressed to put a dent on. If you are a good sport, this can also be one of the funner options.
If you want more than a 1500 point list, your HQ's will all ready be chosen for you.
Long Fangs are your only heavy support. They can split fire, which is nice, but be VERY careful with them. since they have no ablative wounds even a few bolter rounds (hell, even lasguns) can ruin their effectivness very quickly. That being said, they are your best bet for anti-tank duty.
the Fenrisian wolves are one the best units in the army. they move quickly, decent stats, large squads, low points cost. If you are going to max-out on anything, make it these.
Wolfen shred things in close combat, even power armored marines. The trick is to get them there without beint shot to peices. Attach a character with healing balms, it helps some.