Nowadays, almost anything can block a lightsaber, thanks to the extended universe. And every enemy is weak against some forcepower. Take the Felucians for example. Maybe you cant saber´em but you can simply throw them and dead they are
Against all those Emperor-Guard-like enemies, all you have to do is use grappling. Dark Troopers and Purge Troopers, those are the really annoying enemies in my opinion, especially the Purge Troopers. Sure, they die from Lightning, but they still take 20 secs of permanent shock-treatment till the go down.
Many of the knockdowns can be prevented by quick reactions (press A while going down). One thing that really sucks though is the fact that Mr. Saberclown isn´t very quick when it comes to blocking melee-attacks.
And I really don´t know what people always have with Jedi Outcast. That game still has the most stupid leveldesign of all times...well almost.
After having seen both endings on Sith-Warrior difficulty (normal), I can say, for me, TFU is a very nice game. It tells a pretty interesting story, it has some basic character building and -leveling and which other game changes the main protagonist´s costume EVERY Level? Not bad at all.