Play Shen Babe. He is the champion that brought me to league of legend. The feeling when you successfully saved an ally with your ultimate. Kog maw DPS? Press W. Volibear is about to flip someone? Press W and Cancel the FLIP ( Yes because Shen W can negate On hit effect as for hecarim knockback and volibear Flip ). Irelia Dash to you ? Press W and Negate the stun (Also shen is a good counter to irelia so she cant really snowball out of control against a Shen unless you dont play smart or underestimate Irelia power). Zed ult someone? Dash on top of your ally and press W so zed cant AA to empower his ults damage. MF Ult ? Flash Taunt in her face. There is a hecarim jungler in your team? Set up insane engage with him with the help of your ultimate. As you can see, Shen is more like a peeler and a good follower but he can surely engage however you should let someone engage for you if you can. You dont even need to be fed in lane to be useful.
Keep in mind shen is not THAT easy to use ( atleast, more difficult than the old Shen ). he looks easy at first but the more you play the more you'll notice this is difficult to take good decision since shen has ony one CC in his kit and if you fail your taunt, this is way more punishable than any other tank in my opinion. Plus, if you play an agressive version of shen, youll have to learn how propely use your emporered Q and how to zone the ennemy with that tool. Also When your ultimate is down or your TP, you should stay with your team until your ult/TP is up.
Anyway I recommand Watching this guy on youtube or twitch https://www.youtube.com/channel/UCNm7ZA5b47J61vLiAmwMJCA https://www.twitch.tv/linky317/profile or his guide on moba fire http://www.mobafire.com/league-of-legends/build/yummy-rices-top-lane-shen-the-reworked-flippin-ninja-395771.
He is gold 5 at thid moment but it means nothing since he dont really have the opportunity to play ranked but this guy is plat/diamond and he knows his champion.
Sorry for the wall of text, Im just enthusiasm when it comes to my favorite Champ.