Even though you were unlucky with only getting 3 summoners, at least you got a legendary summoner.
Do you ever use the Peakmonsters to analyze your pack openings? Here are your results in case you're curious. Looks like you did well with the $11.02 value vs $8.12 value of the packs (29 packs at 0.28 each).
Edit: you also got 3 Tarsa and 3 Thaddius in your openings. So I think you got 9 summoners total.