Slow, but they seem to be giving Control Paladin a lot of options this expansion and this can lead to a lot of pressure. Assuming it appears as a deathrattle effect on the buffed minion and can therefore be silenced? I would definitely run this in a Control deck, maybe even a more mid-range one.
Bad tempo but regained with the minion. Infinite value (unless silenced). But I don't think it can compete with the present top Tier decks. equipoping, attack two times (or equipping something else) and Play a buffed minion. Then get it back and repeat is awfully slow.
I misread the Card. Since you reequip this weapon, you have infinite value. Or you just start smashing face while your minions control the board.