Drax is a random, muscular alien seeking vengeance against Ronan (and later Thanos) for his newly invented wife and daughter -- instead of a less random, muscular alien made from the soil of a distant planet for the specific purpose of killing Thanos, and whose soul came from an Earth man who had been killed by Thanos along with his wife while their daughter lived and went on to become a superhero (sort of)?
Not really.
Doesn't really matter that Nebula is presented here as Thanos's daughter rather than his (purported) granddaughter either. Even changing Gamora's backstory slightly from Thanos rescuing her a moment before she was to be killed along with her family to Thanos being the one who actually killed them doesn't affect a whole lot, and probably better serves the plot being followed here.
I will say that having Thanos father multiple known progeny is a disservice to the character's roots, though, as -- when he still had his nihilist personality (which appears to be the case for Thanos in the films) -- he took great personal offense to Nebula's claim of being descended from him, as his worship of Death had him claim that he would never sire children.
Obviously this was eventually ignored when the concept of Thane, a son of Thanos, was introduced last year, so it's not surprising to see the movie going a different route with that idea too -- but with Thanos being my favorite Marvel character, and especially as a fan of Jim Starlin's Thanos (i.e. Thanos done right), it does annoy.
But, shit, it's forgivable. I don't and never expected to get Jim Starlin's Thanos in the Marvel Cinematic Universe. They aren't going to be able to have him obtain the Infinity Gauntlet, butcher half the universe, then go on a self-reflective journey in which he saves the universe multiple times from other tyrants and becomes a superhero. They just won't be able to do that.
He'll do the first two things on that list above, and that will be it. He's going to have to be terrible and utterly evil form start to finish for this thing, and that's fine.
If I can put up with that, I can certainly accept an altered detail like Thanos knocking up random space women.
Speaking of Thanos, I have to say I'm very pleased with his portrayal and Josh Brolin's performance. The voice isn't quite what I've had in my head all these years, but it's good, and he's every bit as menacing and shit-inducing as he should be.
Ronan, too (portrayed by Lee Pace) was excellent, and Karen Gillan brought an engaging intensity to Nebula.
That's the villains, but what about the heroes?
Chris Pratt does a great job playing Andy Dwyer in space, Zoe Saldana does a serviceable job as Gamora (there was only so much range really required for this role, though), Rocket is funny as shit, Groot is adorable and Drax is ... well, he gives us a fifth member. He does have some genuinely funny moments, though.
As an adaptation, I suppose the Nova Corps get shafted the worst of anybody in this whole thing, being they're pretty much nothing like what they were in the comics, where they're the Marvel equivalent of the Green Lantern Corps. I wasn't expecting Richard Rider (the real Nova Prime) to show up anyway, though.
Marvel never seemed particularly comfortable with his role as a cosmic character even after he took off in that big role during "Annihilation." They never seemed to know what they wanted to do with him, which is probably why he's been dead since 2010 even while Star-Lord and Thanos returned to comics, despite supposedly dying along with Rider.
Moving on, I'm very glad to see the Infinity Stones Gems lore getting some direct attention, as we know what's coming there. Thanos will end up getting all six and creating the Infinity Gauntlet.
So far, we've seen four of them presented on screen (Space Gem = Tessaract, Reality Gem = Aether, Mind Gem = Loki's staff, Power Gem = Orb of Morag), and I'm quite excited to see what we get for the last two. There's still plenty of time for Marvel to build up to that, so I imagine it will be a while before we see them -- a time of excitement yet to come.
Also, how exciting was it to see a Celestial blowing a planet up? Granted, they went with Eson the Searcher instead of Exitar the Exterminator (the Celestial whom you would expect to see blowing up planets), but he does have a more iconic (of the Celestials anyway) appearance, and it was a treat for fans of the cosmic corner of the Marvel Universe to see any glimpse at these great cosmic entities of the Marvel Cinematic Universe.
All in all, I think I still loved "The Avengers" more than "Guardians of the Galaxy," but only just barely. Hard to say. I'm going to have to watch this new movie again to really make up my mind, being that I've seen the other three times.
"Guardians" may actually win out on the overall fun factor, but, again, I will need an additional viewing to make a final call.
In closing: Howard the Duck. What the fuck?