Hes so weak ! If I go top Id much rather have garen anytime over jarvan... or just about any other hero but this weak sauce that does no dammage and has 0 tanking ability. when I compare Jarvan to Garen I just laugh so hard.
because garen beats most champions that are melee and rely on spells........ J4 is better at setting up kills and picks. Oh and garen cant jungle (^:
yeah cause garen has more CC, better engage and more AOE dmg than jarvan. Garen also helps their AD carries giving them AS buff and lowering the armor
you take him jungle? he is actually pretty decent on the jungle since he really have no weakness (not many strength either but whatever) he can resist invades and invade himself quite decent, have decent clears and can farm pretty fast (provide he has blue buff). Ganks are ok as early as level 2 and superb at level 6. Overall J$ is a jack of all trades that really doesn't excell at anything but can do everything. Consider him a tanky (but less damage) version of lee sin
If you like royalty :D
Gap closer, aoe CC, knock ups, buffs for allies, better tank shred. Has a great shield, slows...
Has a bit of range to him.
Garen just runs at you and is good for the simple minded. Jarvan takes a bit of skill sometimes.
You're probably playing him wrong or falling too far behind, J4 can deal crazy amounts of damage even from a little bit behind, there is a streamer that basically plays him as a top lane assassin and can 100-0 the enemy carries with him. Check him out if you want, twitch.tv/pawnce
For bringing you and your allies closer together.
http://st.elohell.net/public/chill/0fa2d73ba2e21779aeb1d784b35262cf.jpg
garen is pretty easy to kite, whereas when j4 decides he's coming for you the best thing you can do is flash out of his ult, and aside from engage j4 actually does have both damage and tankiness lol. if you're taking j4 top you tend to go full one shot mode instead of tank, tho: is eqr auto combo is reaally strong if you build full ad plus if garen gets behind, he has to build tank and just hope he can catch skillshots in fights or find the nemesis really low for the true damage on his ult: if j4 gets behind, he can still engage for his team, regardless of items or kda
Katarina, go home, you're drunk.
Uh..he does no damage? He isn't tanky?
First off, check league wiki if you want, but J4 has higher base armor and higher base life regen than Garen.
Damage?
Let's say you started with 15 AD from runes, and built a 
. Within short order you would be pushing 125 damage (again this is just early in the game I'm talking). By this time, your enemy laner like Naut, Garen, Darius may already have a giant's belt and be sitting on 1200 life.
With J4's passive, you'll hit for 10% of their current health, for 120. So even though your base damage is 125, you're going to hit them for 245. Throw in Grasp of the Undying for another 3% of their health stolen (healing you, hurting them). That's another 36. So you have a base damage of 125, but can hit them every few seconds for 281, that's a at a low level. Throw in that you have two auto attack resets and you have good damage output.
So you go:
AA (281 damage (base, passive, grasp) Drop banner on their head ( 60 magic damage) (AA reset) AA (125 damage since passive and grasp are on cd) Dragon strike (125 base + 220 level 3 dragon strike with 40 bonus AD at level 5 for 345 total damage) knockup and AA reset AA (125-281 damage depending on passive and grasp cd's)
So, in a few seconds you just dished out no less than 281+60+345+125 =811 damage, and that assumes you don't get in an extra hit or two when they disengage.
Contrast this to the same level 5 garen with 3 points in judgment and 125 AD (assuming he went with the same weapon). He'll Q in and hit for 205 damage then spin for 471 with three points in judgment. That's 676, which is less than Jarvan's damage.
End game, when Voli bear or Tahm are running around with 4000 health, grasp is stealing 120 health, and cadence is hitting for 400 damage. Your base damage at that point should be 225-325, so that's one auto attack dishing out as much as 845 damage. Put that into the combo for 845+240 banner+325AA+480 dragon strike+325AA= 2215 damage before he ults...
So...yeah. I think you don't know how to Jarvan.
If you see the enemy team locked 
and you want to troll your team by assisting him with your ult?
