Stereotypical Sith Lords and no real variety in the force (it exists, but we don't see much of it).
Rip-offs of other characters (ex. the immortal emperor in the Old Republic who is a rip-off of Palpatine).
Along with the above is cloning of characters.
Repeats of basic plot points, such as an infinite supply of superweapons and re-occurrence of the Sith who had been thought to be extinct.
Trying to tie things into existing canon too much.
Shrinking the Star Wars universe (making every random person we see on the street join the rebels at some point or have connections to a major character).
Lots of other stuff.