I think the Director's Edition did a good job of adding a bit more "life" into the movie, a bit more warmth. They trimmed some of Kirk's snapping at the crew (Uhura and Bones) and the pace is better. It's still a slow film, but the Director's Edition, with just a few tweaks here and there really enhances certain scenes, IMO.
I do think the movie was pretty solid and well-paced up until they reach the V'ger cloud. That's where the movie slows way down, with a few scenes here and there to liven things up a bit.
TMP isn't the best Trek movie, and its got a lot of flaws, but I still like it.
It's strange, but it seems like they went out of their way NOT to have any action in it. I've read older interviews with Roddenberry where he said he didn't want to be like Star Wars, and wanted something more "adult".
Just imagine if when the V'ger energy bolts hit the Enterprise, instead of a few strands of energy coming through, it actually blew up consoles and threw the crew out of their seats (as happened so often in TOS). Or when Spock gets zapped by the energy probe on the bridge, he actually does a back flip or something (like Scotty when he got zapped by the Nomad probe in "The Changeling").
Stuff like that would have added a bit more excitement, but Roddenberry and Wise wanted none of that....Kinda strange.
And yeah, the uniforms were AWFUL. They were so bad that they actually took me out of the movie at times.
But like I said, it's still a good movie, IMO...