Let's review what he's written:
Kotor: Generic star-warsy plot with a plot twist that's great if you didn't see it coming but doesn't really change anything or matter at all. No moral ambiguity whatsoever in typical star wars fashion, villains are just evil because they like being evil. Companions aren't that great and are either memorable for comic relief, being annoying or being attractive. Overall a fun story but not much more than that.
ME1: Generic and average sci-fi plot filled with scenes that feel so forced that you can't take them seriously. Introduces some moral ambiguity and Saren is a step up from Malak, although he's a racist and really really stupid. Some companions are surprisingly well-written, while others come off as pure ****** material (Liara) or talking encylopedias (Tali). I'll let you guess which two characters Drew wrote. Overall a fun story but not much more than that.
ME2: Mostly the same as ME1, doesn't feel as weird and companions are much more interesting but missing a plot. Overall a fun...
Revan: Complete trash written for manchildren. Tramples all over Kotor 2 by turning the Exile into a Revan fangirl and retconning how the whole wounds in the Force thing worked, while blatantly ripping off Nihilus to make a new villain (the Emperor). The entire book is a chore to read and even reading the scene where Revan & Exile are murdered is as exciting as reading my shopping list. Tries way too hard to make Revan + Scourge edgy and cool. Overall NOT a fun story and I wish I had read Deception instead.
SWTOR (Knight story): Continuation of Revan but not as awful. Still average, still generic and offers as much moral ambiguity as Kotor did, you're either a pushover or a maniac who murders anyone in sight. Companions aren't memorable except for Kira. Overall a decent story but not much more than that.
TLDR: He's a hack