This should not surprise anyone.
Vanilla Destiny launched with 1 Raid. And with the exception of [b]The Dark Below[/b] which gave us [b]Crota's End[/b], Bungie only added additional Raids during the annual expansions.
There is supposed to be more to the Destiny experience than just Raids.
Raids are supposed to be the big climax to the theme of each Destiny expansion ( Atheon - Vanilla Destiny. Crota - The Dark Below. Oryx - The Taken King. Aksis - Rise of Iron. ) like writing the words [b][i][u]THE END[/u][/i][/b] at the end of a novel. You wouldn't write [b][i][u]THE END[/u][/i][/b] at the end of novel than follow up with more story, would you.
Wait until the next expansion. Hopefully Bungie will have another Raid for you. And just because Destiny 2 is only shipping with 1 Raid doesn't mean there won't be other forms of end game content available.
I know. I guess I just expected more - to be blown out of the water. It didn't happen, but I'll reserve judgement until I see some reviews when the game launches.