The funny thing is taking 2 levels in Warlock with a character that has has high charisma anyway and getting their Agonizing Blast Invocation (+ the other you get which can be anything you feel like.)
Eldritch Blast is a cantrip with a range of 120 FT (or 24 squares) and does 1d10 force damage. Over the levels it improves by adding in more attacks per cast (it shoots off 4 beams in the end, each one can target a different enemy or the same one, separate attack rolls. Each hit adds that modifier.)
The hilarious thing is that, as far as I am aware, cantrips improve with character level, not class level.
So, 4d10 + 4X (where X is your charisma modifier) damage, if you manage to hit all of them. (Since it's multiple attacks it makes them weaker on a crit but more consistent.)
Quite excellent on a character that otherwise has no good ranged options (and a bit unfortunate for the warlock since it appears Eldritch Blast was meant to be their 'thing', and you get access to its full power with just two levels.) Ultimately it's player choice as to what you'd prefer, but... The choice is there. (I know I'd consider taking it if I was a monk, even without the modifier the ranged capability is quite nice. If you're a shadow monk, also picking up the super darkvision is extremely useful as well as thematic.)
Honestly, it's almost like they intended the Warlock to be something people dabbled in, since they have some good utility stuff at level 2. (Monk's level 19 and 20 are terrible anyway.)
And yeah, some of the utility cantrips need improvement. Some like Mending I can really only ever see being useful in a campaign where there's a large focus on equipment wear and tear, and even then...