>>1781558
>>1781404
Tools of Destruction has always been one of my favorites. It plays pretty much like Going Commando, but with better graphics. I like the Pixar-esque style in Tools of Destruction rather than the sort of cel-shaded look they went for in A Crack in Time. Tools of Destruction also seemed to have more focus on platforming, while A Crack in Time had more focus on shooting, and I prefer when Ratchet is a bit more platforming focused.
>>1781580
Going Commando is the best. Not to discourage you, but I'd say it's the peak of the series (maybe tied with Tools of Destruction, but other people in this thread seem to disagree with how much I love that game). Like the anon above mentioned, Up Your Arsenal tried to add online multiplayer, and that ate up development resources, so there are parts of the single player that are clearly just repurposed multiplayer maps and not as fun. And of course the online doesn't even work now, but when it did it's not like it was great. Ratchet wasn't made for that. There is local multiplayer, but it was made for online with many more players, so the local multiplayer is pretty much worthless. Deadlocked then doubled down on multiplayer and combat, to the degree that really it's a spinoff, it's quite different. But it's at least more focused. I still prefer Up Your Arsenal, but Deadlocked is focused on what it does and it does it well.
There are only two mainline PS3 games and they both play more like Going Commando than any of the other PS2 games. Then there's Quest For Booty, which is a very early example of standalone DLC, and thus very short, but it does play like Tools of Destruction, so I like it (it really could have benefit from Challenge Mode, though. For some reason that game doesn't have it). And then Into the Nexus is another budget game, shorter than a mainline entry, but still long enough to be fulfilling, and it is pretty full featured. Excellent game. The real last entry in the series.
Then there are All 4 One and Full Frontal Assault, two other multiplayer spinoffs. But All 4 One is four player co-op and Full Frontal Assault is all tower defence missions. But if you play All 4 One single player as Ratchet, Clank hops on your back and the game sort of feels like a regular Ratchet game. And Full Frontal Assault still has regular Ratchet controls, but every level's goal is a tower defence thing. It's fine. It's also short, though. Was sold at a budget price on release.
The PSP games are both good too, but short, because they're PSP games. Secret Agent Clank pretends it has some sort of stealth gimmick because you're a secret agent, but really Clank just plays pretty much like Ratchet, and it's a good handheld spinoff entry in the series. Much longer and more substantial than Size Matters, which is great, but super short.
The 2016 game is fine enough that I'll play it, but yeah, it's mostly just levels from the original game, but it's missing some of the best levels, and the new levels it adds mostly suck. I like that it adds a big open area to explore and look for crystals or whatever, like later games have, but those aren't the highlights of those games. The rest of the new levels are all even more boring, and don't make up for the levels the game is missing.