This isn't just a #1 seed getting swept by a #8 seed. The Tampa Bay Lightning matched the regular season win record, which is really impressive in today's "age of parity". Just look at how far ahead they finished in the standings. If I calculated correctly, they were about 2.77 standard deviations above the mean in points. (There are 31 teams FYI).
And this wasn't just a single game choke, the Lightning lost four games in a row. People made a big deal when the record-setting Golden State Warriors choked away a 3-1 series lead to the Cavaliers, losing three games in a row. This would be like if that GSW team got swept in the first round.