Interesting. A bit of a departure from depictions in earlier editions. Much more nature oriented...seems they're playing up the fey aspect based on the Celtic origins of the race.
Yep, that has always been the appeal of the Firbolg. I wanted to play a giant towering brute when I picked a Firbolg in the Complete Book of Humanoids, and 5e will never replicate that experience. That is pretty much where the negative reaction is coming from by some of the long time players in this thread.
Speaking of Goliaths, I can't wait until I get to have a Firbolg drop this line. "My kind have no names, but you humans call me a 'Goliath'".
It may not have been an accident that Voadkyn were quietly retired from the game after 2e, and 3e started the trend of Firbolgs picking up some of their traits. I don't think they popped up again in 3e or 4e at all in WotC products (though I think the Tome of Horrors had a Voadkyn).
But, it may have also been an attempt to suppress dat ass
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I'd personally make an attempt to bring back Voadkyn as their own thing, but that's cuz I'm a weirdo. I like the new Firbolgs.
Duergar, Drow, PHB Tieflings all get access to numerous spells per rest as well, and those are not typically described as overpowered. In practice, it seems that most people are more impressed by a relevant +2 stat bonus, a bonus feat, or bonus hit points, than by spell-like abilities.
Verbeegs are my absolute favourite giants. They fight dirty, they whisper "suggestions" into the dimwitted heads of other giants making them more agressive, and are malformed malcontents who are constantly on the lookout for their next scheme.
A Verbeeg giant used properly can be the best middle manager of monsters your campaign ever had.