EmperorSidious2
Master of Magic
People we all know of the seven forms and we all know Lucas isn't someone who goes into detail about everything. So with all of that the way they fight is how their styles are described.
For instance, shi cho is described as wild and sometimes reckless, and is good against multiple opponents and jar Kai. This is seen by how Kit Fisto was just bull dozing his way through droids in AOTC when he just slashed his saber down without any grace or style, and how he was great against magnaguards and how when he got two blades against Grevious he was able to beat him. This also could explain how he lost to ventress as she was a single opponent however with jar Kai but no cover or anything to shield him.
Makashi. Dance of the duelist, eloquent, reserves energy, great for lightsaber to lightsaber terrible for blaster deflection, and weak against power attacks and can't generate any sufficient amounts of kinetic energy. This is seen by how Dooku sometimes appears to be dancing, how he is graceful and precise, how he can fight for long stretches of time for someone of his advanced age, is possibly the most refined duelist of the age, yet displays some difficulty with blast deflection, and how Dooku mostly evades attacks instead of meeting them head on, and can't just push anyone back with his offense in terms of strength.
Soresu- simply put completely defensive and great against blast deflection but no offensive applications. Obi wan after 3 years of progressing with this style can last long against many many opponents, was able to hold up the 18 strikes per second assault of General Grevious and keep up with Anakin Skywalker for a lengthy period of time without tiring and how he has survived the clone wars with blast deflection.
Ataru. It's described as being extremely fast passed and agile with a lot of jumps flips and kicks. Ola displays this in all of his fights as he can be seen darting around his opponents with his speed and how he is seen always on the offensive one of the prime aspects of Ataru. This also seen by how when fighting against Dooku all he did was spin and jump around as to per the norm of Ataru.
Djem So. Basically put. Brute Force Brute Force Brute Force. Anakin is,seen basically trying to power through his opponent and how he is very strength oriented in his mind set. Also when attacked he delivers decisive counters to an enemy's attacks.
Niman. Niman is best said as a gate way to jar Kai dual blades and the interrogation of force powers in ones technique. This is seen by Sidious as he is most notably the best master of Niman as seen how he handily bested Darth Maul and Savage Oprres with two blades, despite the lack of Strength in Jar Kai using only one hand. He is also a master of integrating force powers into his lightsaber sequences.
Juyo. Like Djem So, brute force brute force brute force. However this form is stronger than Djem So however at the expense of control, and defense. This is why practioner a of the form are required to master more than just Juyo to make up for this. Darth Maul a practioner of the style compensated with Djems So being his primary style and Sorseu being his defense. Also how Darth Mul had Niman and Teres Kasai. This would also be why he preferred the Saber staff as it is better for strength blows and leverage, but lacks a proper defense as well.
Vaapad. Ok I'm going to explain this since Quan is not cooperating. Vaapad is a personalized style for personalized people. This style is a variation of Juyo so it still retains the aggressive strikes of Juyo however with more control and a better defense. This is seen by how Windu was able to block Sidious' blows and even stalemate him due to Vaapad channeling the dark side energy of Palaptine. This is also shown by how Vaapad works on dark side users/angry psychopaths, this is a reason why he would be be,ow yoda and on par with Dooku as yoda is neither raging more angry and is a lightsider and Dooku is clam and calcualting. I don't add Sidious because although not a raging SITH we all saw ROTS so no excuses made for why it wouldn't work against Sidious. However I do believe Sidious threw the fight but that's for another rant. So there you have it my own opinion on the 7 forms and there uses and where they are in the film and Clone Wars series.