Good to pick with teamcomps where your mid and top will need ganks.
Good to pick if you have experience with pathing champions IE: Hecarim
Good to pick vs immobile mid laners. Your ult is great, If your mid lane has a gap close or CC.
Look to ult while you are roaming in River between Mid and Bot to save your ADC or Mid. Your ult has inedible range. Most new Bards do not realize this.
To supplement has average laning phase, I like to pick him with some mana regen yellows, and armor reds. This allows me to be a great sustain lane.
I think, in general, ADCs prefer to pick champs with an escape or considerable range when coupled with Bard, so that they can avoid dieing while you collect chimes. Personally, as a Bard, you should only roam with purpose, or if your AD isn't going to lose any minions.
Other info: You can supplement your laning phase with IGNITE. (only recommended if your team has enough CC to deal with assassins, otherwise take exhaust). a few movement speed quints is great for dodging skillshots in lane + collecting chimes and roaming. Mana regen yellows are fantastic, however chime collection can help with mana problems. I recommend not building AP. I recommend building CDR and health. Early items include sighstone / eye of watchers + mobis. Aegis vs Frozen heart depending on enemy dmg types. Oh, also, several players max E second for the movespeed boost. And often is is beneficial not to level E till level 4.