But it's not really a character driven comic either, because none of the characters have really changed since their inception.
Ethan is still an idiotic Mary-Sue who everyone tolerates for some reason
Lucas still does nothing relevant
Zeke is a robot with distaste for humanity
Lilah is the akimbo-armed, eyerolling nanny who cleans up Ethan's whoopsies and for some inexplicable reason stays in a relationship with him.
They have changed little since they were introduced.
Take the latest comic arc, for example. Tim builds up and builds up in his own way (surplus panels and word balloons for all), only to show Lilah turning that other guy in to airport security under false pretenses and going back to Ethan automatically. Next couple weeks, if we don't flounder around on a game parody binge, will involve Ethan rebuilding Zeke and finding out who broke him in the first place in his own childish way.
There's little continuity, as well. (With the exception of that one arc where they had to move because the apartment blew up.) It always follows the same formula:
Setup - Buildup - Buildup - Wham it's over in 2 comics or less - status quo - LOL PARODIES LOL
Part of the problem is his obsession with the 2x2 panel and overuse of superfluous words. I did an experiment a couple months back where I took random CAD strips, knocked them down to 3 panels, removed text, and didn't negatively impact the comic at all. It's not hard.
Don't even get me started on the stolen jokes, virtually unchanged arc, and lost potential. Tim draws much better than that when he tries (go look at the art blog), and of course, the recycled copy/paste facial features.
If you want characters, go for Questionable Content.
If you want video games, go for Penny Arcade or Digital Unrest.
If you want characters but are afraid of changing art, go with Real Life by Greg Dean. (It's drawn in Illustrator, so the art style is static for the most part. However, it shows what character writing can do.)