Do you think it deserves C tier (where it is right now)?Sheer Force boosts moves that have secondary effects at the cost of said secondary effects, like a chance to flinch or lower the opponent's Speed. (convenient that the gen this ability was introduced also gave Flare Blitz a 10% chance to burn) It doesn't apply if the effect is a cost to using it or a better critical hit chance. (so no getting around Superpower or Hammer Arm's stat drops, and Stone Edge only has a boosted critical hit chance.
From my experience with it in White 2, Snivy is... awkward. It's fast and can certainly do a fair bit with Leaf Blade/Leaf Storm, and Coil is nice... but good grief is its move pool barren of coverage. Near anything that resists Grass and/or Normal is going to force it to switch, as that's all it gets in its level up pool, and its TM coverage is not much better. I can't imagine Snivy doing any better in the original set of Unova games. (good if you want a challenge, but not for an efficient run)
What I don't get is while it may seem low at first, C tier is actually better than average. But looking at the other Grasses;
-Pansage: Meh. Decent movepool but Vine Whip as your only move early sucks.
-Cottonee: Good in theory but garbage in practice. Simply too inefficient to be highly ranked.
-Petilil: Clearly better even though it has bad coverage. Sleep Powder + Quiver Dance > Coil.
-Sewaddle: Lot of weaknesses but better overall. Boosts better with SD lategame, and has distinctly more variety.
-Deerling: Rough start but variety blows Snivy away, plus Speed and Attack comparable to Leavanny.
-Ferroseed: Good but not very efficient for in-game due to slow speed. Far from horrible but not great either.
-Virizion: Yeah, no. A detour AND you need another legend to catch - that is just too much effort to be worth it.
-Maractus: Actually not that bad. Used it briefly in a run I cancelled. It's better than you'd think, though not a world beater.
Overall, those early Gyms Snivy is around for is mitigated by its competitors having actual move diversity. What does everyone else think about Snivy? I've heard a lot of people drop it in the Unova games, and labeled as one of the worst starters of all time. It's usable but B tier is a little...iffy with bad offenses + movepool.