Activision Blizzard shares are down nearly 50% in the past six months and investors should be "kicking the tires," given an improving setup in late 2019 and 2020, Piper Jaffray analyst Michael Olson tells investors in a research note. The analyst sees five reasons to do the work on Activision, including: increasing near-term talk on streaming, potential E3 announcements, anticipation around improving fundamentals in 2020, management's re-allocation of resources towards key franchises, and valuation. While it may still be early with a lack of new game catalysts in 2019, patient investors should consider "chipping away at a position" in the stock at current levels, Olson writes. He maintains an Overweight rating on Activision Blizzard with a $52 price target.