Shadowblade, while a strong item if used effectively, suffers from two problems:
1) Most people who pick Shadowblade start taking unnecessary risks as if they were Clinkz or BH. In pubs, people will usually be too selfish to get wards/dust, so there is no problem here. The trouble arises when people become dependent on Shadowblade as a "guaranteed" escape tool when really it can be nullified with only 100g per gank/fight. It is only as good as your opponents are bad.
2) As an initiation tool, it's safer (doesn't deactivate and you can get a better position), but costs way more gold (a luxury many initiators don't have) and provides a bunch of useless stats. Blink is better in 99% of cases because it gives you the element of surprise, is only countered by Radiance and a few specialized skills, and allows you to traverse cliffs/woods.
1) Most people who pick Shadowblade start taking unnecessary risks as if they were Clinkz or BH. In pubs, people will usually be too selfish to get wards/dust, so there is no problem here. The trouble arises when people become dependent on Shadowblade as a "guaranteed" escape tool when really it can be nullified with only 100g per gank/fight. It is only as good as your opponents are bad.
2) As an initiation tool, it's safer (doesn't deactivate and you can get a better position), but costs way more gold (a luxury many initiators don't have) and provides a bunch of useless stats. Blink is better in 99% of cases because it gives you the element of surprise, is only countered by Radiance and a few specialized skills, and allows you to traverse cliffs/woods.