Tactically, it seemed so differently than RS stuff, simply because of the 'take them alive if you can' dynamic. Oh and the snipers are realy a cheat since they don't follow the ROE and don't penalize you for shooting a non threatening armed suspect. Wedges can also be very useful especialy if modded to let you carry extra ones (4 slots is a joke and wedges can be reused IRL) Always pay close attention to the floor plan, plan your entry carefully, and pick your equipment based on the suspect intel you have. My advice is to take it slow when possible, always mirror, always cover your back, breach and bang when suspects are present in a room. LTLs also become near useless later on as suspects frequently use gas masks, helmets, and body armor which renders everything other then the taser and flashbang useless. Gas is often unreliable as most of them carry gas masks in the later missions, and flash bangs don't have much of a range and the effect can be blocked if bounced wrong, so don't depend on them with your 'life'. Modded the enemy AI will take and shoot hostages if you get to close, often refuse to surrender until you forcibly cuff them, circle round and attack from behind, use cover and teammates, fake surrender then suddenly draw and open fire, unsurrender and pickup weapons and shoot back if you turn your back on them, etc. The only thing they are good for is shooting back as they have inhuman reflexes.

My officer AI though is kind of dumb as far as positioning and timing (SWAT 3 did it better). I don't know what AI you were playing with Dowly but on my system the enemy AI is nasty effective. Personally I think its a lot more fun to play the game and act as if you are a real swat operator, such as using restraint when using LTLs, and only shooting when you are permitted to under the general ROE SWAT uses. I use to play with a modded version of SSF (Sheriffs Special Forces) which improved a lot of things. One of my favorites, coop is a lot of fun too.

Swat 4 ssf