No, no he is not. Ike is immensely strong, but hes not even the game's strongest character in terms of pure force (Dedede's forward smash, for instance, is even better than Ike's, and Lucas' up smash is at least comparable to, if not better than, most of Ike's smashes). And with how slow his attacks are, if you mess up with one, any good player will rush in and punish you - I love playing Sonic when against an Ike for exactly this reason. Hes using a smash? Roll out of its range, then dash in and grab him during the end lag. Hes charging quick draw? Dash just out of its range, taunt him if hes a bad enough player not to use that against you, and smash him with a quick attack when he pulls up short.
Ike isn't terrible - in the hands of a skilled player, he can be used very effectively. Certainly against unskilled players who don't know how to use his slow speed against him, hes an absolute beast, even if played by another unskilled player. But he isn't even close to overpowered, not by a long shot.
Zevox