The guitar work is flawed on those recordings, but generally speaking all of the instruments need improvement. I personally think everyone could benefit by practicing with a metronome, and in fact if you can crank a click track up on the PA and have everyone play along with it, it could really help.
From my perspective, both guitarists are trying to play things beyond their ability, or have just not spent enough time getting things straight. The drummer has tempo issues in all of those recordings, and I also agree with whomever said there are volume consistency issues with the bass and the drums. The bass is arguably the best in these recordings, but the timing ebbs and flows as each song progresses - way more than would be acceptable in any band I've been in. Coupled with the volume consistency and it just adds to the lack of tightness overall.
When you guys record, why not record to a click track? I for one have never been in a studio where this was not a requirement, but then again I have not recorded thousands of tracks either. I also agree that the singer is weak at best. He doesn't sound like he's singing from his diaphragm and he's subtly pitchy here and there. If he was belting it out, you'd probably really hear the pitchiness in his vocals.
I know you only wanted feedback on the guitarists, but like most replies in this thread, the whole band needs some woodshed time to make things work. I don't think it's worth running away from, but work will be required by all of you if you're to bring it up to basic satisfactory performance level.
Just a question and I don't mean to insult, but how much weed is involved here?