These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Some fans think this game's the best one in the series because of its Darker and Edgier plot, and because you get to do more than just pilot an Arwing. Many fans loathe the game because they ignore the good qualities and simply fixate on the fact that you're on the ground too much, rather than flying around as in a typical Star Fox game.
Many fans despise the ground missions (in large part due to the controls) and wish they got to pilot the Arwing more. Others tolerate them to a point where the game is at least worth playing. A few fans would go as far as saying that the ground missions are better than the Arwing ones.
The voice acting. Quite a few people prefer this game's voice acting over Star Fox 64 because it isn't so cheesy, the dialogue is more believable, and the voice actors and actresses are taking their lines seriously. Others found the lines and dialogue dull, forgettable, cliché at times, and worst of all, not worthy of becoming a meme.
It's Short, so It Sucks : The game can easily be beaten in a couple of hours. The main problem is that unlike Star Fox 64, Assault doesn't have much Replay Value and suffers from being too linear.
Rescued from the Scrappy Heap: Slippy, for some fans. While he's still not the most likable character, he's much more tolerable compared to his Star Fox 64 version. He can bring up the bosses' health bar right at the beginning of each fight (as opposed to halfway through) and he even participates in a ground mission with you. While he does still need to be rescued from danger frequently, Falco and Krystal get in as much danger as Slippy does, so all of your teammates feel like The Load sometimes instead of just him. At the very least, they made sure he wasn't voiced by a woman this time around.
So Okay, It's Average: The fans who didn't flat-out hate the game thought it was okay, but not great. The ground controls are criticized by many, and more than enough people have brought up the fact that many of the missions aren't Arwing-only. However, the same fans also praise the game for having a great soundtrack, an amazing story, and improved voice acting.