I disagree.

Frozen Soldier, Tortisian Fighter, Naga Fire Wizard, and Skeletal Warrior are not very strong cards even with Shield. (Their main weakness being very vulnerable to magic damage).

Serpentine Soldier (at lower levels), Frost Giant, and Gloridax Guardian have narrow uses but generally aren't that amazing despite having Shield.

Elven Defender and Chain Golem are rarely used in Ranked and All Edition tournaments but are actually very strong in Untamed only events.