I played a ton of SWAT 4 back in the day and RoN never really came close to feeling like it . Since the initial release, the AI got progressively worse. I believe the devs decided somewhere down the line the game would be too easy, if the suspects were more compliant. This notion was later strengthened by all the no fun allowed "hardcore" milsim gamers, who flocked to the game after it gained popularity on YouTube and Steam. I do not see the point why they implemented level dependent AI parameters, if they refuse to adjust them to fit the given scenario. Not to mention, they do not seem to work as intended, cause I tried to fiddle with them to create my own mod. The map specific adjustments made little difference, only the global AI parameters worked somewhat. Alas, I just couldn't find a good middle ground between piss easy, or the default difficulty.
it feels like Rainbow Six
They really should have rebranded the game as a seal team six simulator. Then it would make sense why every opponent you come across is hostile by default. I strongly suspect this is what they eventually wanted, but their change of heart came way too late into development, so they had no time to redo all the assets and didn't want to preemptively piss off those who expected a spiritual successor of SWAT. It's a shame really.
I probably mentioned this before, but aside from the AI, I really, really dislike the maps, especially after their somewhat recent redesign. Almost none of them feel like real places, built by actual human beings. Most of them are gargantuan, spiraling mazes with a strong "this is a video game level" vibe. I get it, if the structures were designed in a realistic fashion, the game would be deemed too easy, because you could swiftly corner suspects. Unfortunately, the devs lack the talent and creativity to work around this issue, which kills any and all immersion for me. It leads to ridiculous scenarios like suspects wandering into the open street on the gas station map, standing around waiting for you, while in real life they would just run off. Where the hell are the manned police cordons? No, lack of funding is not an explanation, screw you Void! I bet the reason why they failed to implement NPC officers surrounding the area, because they would gun down all the perps for you. Despite all the dog and pony show about the "sophisticated" animations, the AI rarely barricades itself, or takes cover, they choose to zoom around the level instead.