They do have their advantages, yes. But not only are they are lacking a naval experimental, they are lacking in any units to effectively assist naval units at T2 as well. The UEF have shield boats, very effective anti-submarine units, and powerful hovertanks. The Aeon have hover tanks that are weak but cheap, fast, and with a decent range, good hover shields, and hover flak. The Cybrans have mobile stealth (which has torpedo defenses almost as good as the cooper) and a stealth ACU with powerful torpedoes.
The Seraphim have no 'bonus' units like that available until T3, the only stuff they have to support their navy are T1 hover arty, which are almost worse than useless against a microed navy (feeding it veterancy) and hovertanks that are the same cost as the blaze, but demonstrably worse. They have hover flak, but they don't need it, because Seraphim cruisers already have flak...
The only extra that Seraphim have at T2 navy is submersible destroyers, but from what I've seen, that often serves mostly to halve their destroyers' DPS, so they usually function as tank sub hunters. Since the other factions' sub hunters are cheaper... They have a powerful navy for smaller T2 engagements, and one that's easier to field (less work creating a balanced force) but they don't have the unit synergies that really kick a navy into high gear, so they struggle in larger engagements.
The Seraphim really have to get to T3 to dominate the seas. And once they do, they need to have a properly mixed naval force ready, because Yathsous alone are - well, I wouldn't say not particularly powerful - easy enough to defeat, maybe? They also need to do it fast enough that they can assemble a fair number of Yathsou, because they have no other means of stopping an experimental that's crossing the water.
So yes, you can expect an "Ahwassa up the ass"
if you are trying to hold off a Seraphim navy overwhelming you with Yathsous, but you should either be or getting your own experimentals into their base or gaining control of the seas before a Seraphim player can get out a good number of Yathsous and other ships at the same time. If you can't, you were likely outplayed anyway. They might still be too powerful in that role still, but I've always understood it to be that is the general idea for how the unit is supposed to work, fitting in with the Seraphim style of "fewer units that do it better." Well, that's the impression I've always gotten, but honestly? I don't use Seraphim myself, and I don't often play against good seraphim players, and I'm not particularly good myself anyway.
Statistics: Posted by Mycen — 26 Jun 2013, 06:18
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... I often use the "select all antiair fighters" hotkey of GAZUI and this is selecting the t4 bomber as well, so I miss some times the attack order in front of the target due to unit movement 
yesterday I had this two times I guess...