I thought it was mediocre. Nothing about it stood out or was memorable. I thought the cast sucked and none of them gave noteworthy performances; if they were to completely recast the F4 for the Doomsday movie I doubt anyone would care. Johnny and Ben both lacked a personality outside of riffing on each other and occasionally Reed. Johnny's lack of personality in particular felt weird -- making him a playboy who has an active but ultimately hollow and empty love life would have only enhanced his role in the story as he connected with the female Silver Surfer.
With Ben, they largely removed his angst over being a rock monster and he really has nothing to do for most of the movie; after he pilots the space ship he basically becomes a background character. They couldn't even bother to give him a fight scene with the Silver Surfer. Could've had him trying to stop her from destroying the teleporters while Johnny finished up his linguistic project. Instead, he's given a few completely pointless scenes revolving around his Jewish heritage, which add nothing to the film. Speaking of the linguistic stuff, it felt like make-work, something added to the plot just to give Johnny something to do, even within the film Sue tells him that Reed could easily whip something up to quickly complete it. The subplot doesn't even really mesh well with Johnny, who typically is only interested in mechanics.
Ultimately, Ben and Johnny feel like they had all the rough bits of their personalities sanded down until they were left with nothing. Even Reed felt like he had his personality sanded down, his worst character flaws of sometimes being an impatient asshole and being neglectful are largely absent.
The plot was serviceable. I did like the F4 being proactive and deciding to try to stop Galactus before he got to Earth; that whole stretch was probably the best part of the movie. The F4 basically being the world leaders was retarded and was undeniably lazy writing, likely done just to patch up possible plot holes instead of doing serious rewrites. The Silver Surfer's heel turn felt unearned, yet somehow still managed to take up a chunk of the film. The tone is also weirdly inconsistent -- they have no problem having HERBIE in the film, yet the movie feels embarrassed to have Thing shout out "It's clobberin' time!"
It also feels like it's missing an act or at least a few extra scenes. There's a scene towards the end where tensions finally boil over and they start arguing and picking at each others flaws, and it's all treated as if the stuff they're arguing about were pre-established in earlier scenes, yet they weren't. Overall the film feels hollow and like it was heavily reshot or otherwise pieced together from different versions.
