Outside of Honour Mode, sure. Haste is plenty powerful and is one of the premier spells to spend Concentration on.
In Honour Mode, where the spell works more like it's supposed to, it's a lot more balanced and less important for a Paladin to be concerned with (Especially as you want battles to be over quickly, so using more spell slots on Smites is a consideration).
There are ways to lessen the need to use Haste as a Paladin even on Tactician and below though, such as not using Oath of Vengeance (So Haste isn't available for the Paladin), using Sorcerer or Druid to provide Haste to multiple characters (Via Twinned cast or Armour of the Sporekeeper), or simply relying on alternate means of Haste such as Potions of Speed.
