I remember many years ago hearing a lot of acclaim for KotoR and decided to check it out... it was utterly dull. I dropped shortly after the "3, 2, 1" scene at the bar where he shoots a guy blocking the exit. Last year I tried the game again a second time, and again found it to be unengaging. I spent a lot of time alt+tabbing out to browse internet forums rather than having uninterrupted play sessions. I didn't find the NPCs interesting to talk to. The combat and character building was boring. Music was forgettable.
Taris is such an ugly starter planet. Fortunately three later planets look nicer (Dantooine, first Kashykk level, and the coastal view plaza on Manaan), but it's a big turn off.
I was peeved that the dialogue options were binary Jedi bootlicker or cartoon evil. There was no option to say "I am not onboard with the Jedi's strict laws, but you are evil and I will oppose you nonetheless".
The final fight encounter is a let down, since it's just a 1v1. The battle system is meant for parties vs multiple targets and isn't enjoyable for 1v1. It amounted to just spamming Force Push over and over to keep the final boss stunned.
I think another issue I had with the "Old Republic" series (actually all Star Wars stuff made after RotS) is that it is visually unimaginative. It's supposed to be set thousands of years before the Lucas films, but it just looks like the Lucas films (specifically the prequel trilogy). These game could have been set during the Clone Wars and I wouldn't have known the difference. If you're going to be "thousands" of years in the past, then actually do it. Would've been nice if you got to see a time before people were running around with Lightsabers, before Coruscant was a fully developed planet city, before there was a galaxy spanning Republic, before hyper drives were so developed that people could zoom across the galaxy in hours, etc.