I think Im a @#$%y tank

[TouchandFeel]

Some general tanking advice.

1) Use your cool downs in a smart and fitting order. For larger 10+ mob pulls it is usually best to pop your CD's in decreasing order of effectiveness, for example using Sentinel+Convalescence as the first part set of CD's (unless you need to pop Hallowed) since you will have more enemies attacking you and should need your heaviest defenses up front and then you can cycle to the lighter ones as enemies are killed off.
2) Utilize your CD's in combinations that enhance each other or play well off each other, for example my go-to regular CD combo I use pretty much every pull is Fight or Flight+Bloodbath+Rampart. FoF+BldBth play off each other since FoF increases damage out and therefore increases healing in from BldBth slightly. Also they are all on the same timer so I can count on them always being up together.
3. Get those WAR cross class skills, especially the CD's.
4. Sometimes its actually best to not start with a lob since a lot of dps like to just start unloading as soon as they see mobs agro. If you have trigger happy dps, it may be better to just run into melee range and start with a single RoH attack (not the full combo) and then start with your regular group agro rotations. This could potentially make positioning a little harder.
5. For larger pulls, it is best to focus on using flash to keep group agro and using your Riot Blade combo to regain MP. Using your RoH combo is better saved for when there are 4 or less mobs.
6. Use Spirits and Circle when you can, they are a good bit of extra damage and agro, especially Circle when you are first establishing group agro. For example when you have you mob group in place doing Flash>Circle>Flash right away is a good way to establish group agro in minimal amount of time.
7. As has been mentioned, keep the group of mob on one side of you so you don't lose block and parry as they make a huge difference against large packs of mobs.
8. Always be thinking one pull ahead. Pace out your CD's so you will pretty much have something available for the next pull.
9. Most importantly, remember every good tank was a crap tank at some point. They got good by keeping at it, learning and improving. That is the real difference between good tanks and bad tanks, perseverance and the desire/willingness to improve and learn.