My Routine, Critique welcome

I have been lifting seriously for about 3 months now.  I found thissite about 2 months ago and ever since I have applied a lot ofknowledge I have gathered from you all.  I first just want to say thankyou to everyone.

So I found a 4 day split workout and I have stuck to it for the 3 months.
It goes:
Monday   - shoulders, triceps
Tuesday  - Back
Wed       - Rest
Thursday - Chest, biceps
Friday     - legs

At first I was using a lot of machines but now after reading this forumI have slowly moved towards all dumbell and barbell exercises.

My routine has slowly morphed into these exercises:

Every workout I start with 5 minutes of cardio, then I stretch and thenI do random lifts (power clean, squat, ect.) with the 45lb Barbell towarm up.  On each of my heavy lifting exercises I do one warm up setRuffly 1/2 of my intended weight.
Monday:
Shoulders
Clean & Jerk 5x5
DB OHP 4X12,10,8,6 Increasing weight each set
Sometimes I do 3x10 shoulder shrugs too
Bent over side lateral /w cable 3x10
Triceps
JM bench press or close grip Bench press 4x12,10,8,6 increasing weight each set.
Skullcrushers or rope pulldowns 5x12,10,9,7,5  Increasing weight each set

Tuesday:
Back
3x5 deadlift
5x12,10,9,7,5 wide grip pulldowns increase weight each set
4x6-8 Bent over barbell row
Abs
3xto failure Crunches
3x15 dumbell side bends

Wed:
Rest

Thursday:
Chest
5x5 BB bench press or DB bench press
5x12,10,9,7,5 DB flys
5x12,10,9,7,5 incline DB press or dips to failure
Bicep
5x6-8 alternate hammer curls
5x6-8 Reverse grip BB curls for forearms
3xtofailure pullups

Friday:
Legs
5x5 squat
4x6-8 alternate lunges
3x15-20 Calf raises
Abs
3xdecline weighted situps
thinking of adding another ab exercise here

So this is generally what I have been doing lately.  I am not verystrict with doing the exact same routine everytime I might mix up oneof the isolation exercises a little bit with different reps orexercises. I always do the same compoud exercises.

criticism and suggestions very welcome. Thanks

I am 182lbs 5'8 19 years old about 17% BF:
Here are some pics

Attached Image(s)

I'm not going to say you won't see progress from doing that type of routine but due to the fact you've only been training for a short period of time, I certainly think you would see more progress by having more frequency in your training.  At present you're only working your muscles 1 X weekly and allowing them to recover for 5-6 days.. Simply said, it's a waste of time that you could be training your muscles.. I would suggest doing strictly compound exercises with a good 3 day full body or 4 day upper/lower split..  If your diet is good you'll see some incredible strength and size gains.

There is never enough time to do everything, but there is always enough time to do the most important thing

 

My diet is pretty great now.  It's everything that people suggest.
Could you link me a workout that fits that?

Here's a link to a 3 day fullbody routine..
http://www.discussbodybuilding.com/3-DAY-FULL-BODY-m303404.aspx

You might want to do a search here on HST. 

There is never enough time to do everything, but there is always enough time to do the most important thing

 

Also when would a routine like the one I have been doing be best?

never do static stretches before u lift!

u will not be able to reach ur strength potential

Current: 19, 5'11", 190@7%

bench:305 squat:370(atg) deadlift:475
Goals: 4plate squat, 5plate dead

"obsessed is a word the lazy use to describe the dedicated"

Chasm378


Also when would a routine like the one I have been doing be best?

When you are at a level where you're training intensity is off the chart and you're pushing your body to the limits with massively heavy weight and your body might actually need 5-7 days to recover. Basically something the average beginner or intermediate lifter will never consistently do.

The average lifter only needs 36-48 hours of recover time before the same muscle can be trained again. 

There is never enough time to do everything, but there is always enough time to do the most important thing

 

Just wanted to make a comment on the "Training muscle groups once a week" thing...

It's my understanding that the 36-48 hours rule is the MINIMAL amount of time for rest in between workouts.  However, once a week would allow for better recovery time. 

And quite honestly, when most people say that they train their muscles "once a week", like I do, they're not really doing so.  That's b/c of how certain muscles act as synergists on various other exercises (i.e. anterior deltoids on incline bench).

Just my two cents..

Current 4x7's:
Flat Bench: 305lbs  
Back Squat: 405lbs
Deadlift: 315lbs (Stiff-Leg)

Current 1RM Maxes:
Flat Bench: 345lbs
Back Squat: 515lbs