Do you think the dragons feel too weak or underwhelming?

To some extent, yes. While Baron is not in the best spot right now, at least he has some effects and abilities that challenge the player and can be played around. By contrast, the drakes don't really do this, and the rework the Dragon received in Preseason 5, which turned it into a more challenging objective with an extra ability, got reverted, leaving it back to a state where fighting the thing amounts to just paying a health, mana and time cost. The differences in the drakes' stats and attack patterns are also meant to encourage different strategies for clearing them, yet in practice that never happens, and merely makes the objective a little less consistent in how much it affects your health bar. The drakes could definitely stand to have some more interesting gameplay effects, so that they really do feel like more of a boss fight.

On the flipside, the other issue I take with the drakes is the way they give out power, which I think is itself not the most appreciable: instead of giving out just one, clearly recognizable effect, drakes instead reward a whole bunch of different, permanent stat boosts, which is pretty much the worst way of conveying power. It's the reason why the Cloud Drake had to have its out-of-combat movement speed massively buffed, purely because its reward felt weak, even when statistically it did increase win rates by a fair amount. This, in addition to the drake RNG, is one of the reasons why I feel the elemental drakes were a gameplay miss, even if aesthetically and thematically they're really cool. I think in the end it might be better to revert to just one drake in terms of gameplay and bonuses awarded, while still randomly cycling through elemental drakes for cosmetic purposes.

i agree, mostly because everyone still complains about how useless the air drake is, and to some extent all the drakes are semi useless with their differing powers and bonuses.

the two most contested drakes in most of the games ive played (not in general) are infernal and earth drakes, (imo infernal should be a separate drake and the current "fire" drake should be the inferno) the stat increases the others give are very one sided to certain team comps and near useless on others,

example the ocean drake gives you greater health regen which is fine, unless your team is a group of squishy champs who build some form of lifesteal at which point your lifesteal is healing you faster than the drake buff making it useless.

Yes, they need more HP and the ability to apply grievous wounds.