Skill macros are bad for summoner because what skill you use is completely changed depending on the situation.
My opener for big groups. 3+ mobs.
RS B2,M,B Contagion. Swift Shadowflare, Bane. Miasma II Blizz II spam using Fester on mobs with the highest HP so your DoTs can wear down the others.

You can weave your AOE pet skills in there at the start if they are mostly grouped. Otherwise just wait until you have your DoTs up.

Single Target is pretty much the same for me other than I use Fester right away and don't use Miasma II or Blizz II. I use Ruin II to weave in CDs and pet skills but otherwise Ruin spam.