I went back to the old D1 heroic strikes and although they have the same formula (Scan, protect 3 waves, proceed), I didn't find them as big as a chore as in D2. I had a lot of fun.
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Its because the strikes in D1 are shorter, and the adds are less tanky.. there are more adds in those strikes, but they are not as tedious to kill as the ones in D2. The strikes in D1 are just fun.. fast paced, still challenging, and not 20 minutes long.