All online = Cov / Bomber spam

No???

Bomber spam is pretty common, as is fighter spam (to of course counter bomber spam), but corvettes are only viable early game, and can be dealt with easily via flak or illuminators...

Yes.Carrier spam is only viable counter in a lot of cases (and always against vasari).

hmm kinda.. i mix my fleet, to actively counter everything, not necessarily mass something, however when titans get on the field i build bombers and eventually my own titan.

I don't understand people being upset about the corvette spam. It's so easy to counter. Make the 2nd Military Structure and build 5 flak ships at start. It will totally counter 15-20 corvettes. I am not sure but i would say that 25 flaks would own 100 corvettes. Also you can save those Flaks for the bombers. I dont think the problem is spamming, you just need to balance your Economy and Military.

Corvette is the food of Flak!

Lol...that only works against people who are dumb and don't build LF...on a per cost basis, LF+corvette fleets will always beat LRF+flak fleets...the only reason LFs and corvettes start to wane as the game progresses is because of titans and AoEs....LRFs and flak also are better on a per fleet supply basis (which matters when you start to reach the higher fleet supply levels....

I haven't build single corvette in last 5 or even 10 games i played

Still getting a few Flaks makes a difference than spamming 1v1 Corvette battle. And to talk about LRF + Flak vs LRF + Corvette, i dont know man, it has worked for me. I usually go Flak if i see my enemy pump out 10+ Corvettes at start, and then try to get 5+ more LRF than my enemy. Also Flaks have a nice Hull and usually the enemy starts to focus fire the Flak (To protect their Corvettes) which is also good as they work as tanks (If i remember correctly Flaks with no tech can take 1500 Dmg). Hasnt failed me so far .

Flak is a good counter for mass corvette spam, and probably the cheapest.  I've also found that (of course) the Eradica is good, AR's "Wail of a Sacrifice" dishes out damage that can take out a corvette spam, and my personal favorite, a Lvl 6 Marza Dreadnought with Missile Barrage.  Whenever I'm TEC, I always start off with a Marza capital ship due to its lvl 6 ability.  However, the obvious problem with that is the amount of time it takes to get the thing up to lvl 6.  However, once it reaches that level, the only thing that can really stop it and a fleet of Hoshikos are bombers/fighters.

There is no question that flak is the single best counter against Corvettes in a pitched battle...however, it is really only safe to build flak that early in the game if the enemy is only building corvettes...if they are mixing corvettes and LFs, equal skill and equal economics will overwhelmingly favor the LF/Corvette fleet for several reasons:

• On a per cost basis, LF/Corvette fleets will beat LRF/flak fleets
• LF/Corvette fleets require less labs for TEC & Advent...
• LFs and Corvettes both are faster than flak and LRFs...in fact, LRFs are rather slow and have a very difficult time chasing down ships, especially across multiple gravity wells...the LFs and Corvettes are better at striking quickly, raiding planets, avoiding the enemy, retreating quickly when things are looking bad, and pursuing enemy capital ships...
• Corvettes have anti-light weaponry which is great for wiping krosovs and LRMs...this is very useful for expansion because the krosovs can bomb out your planets and the LRMs can outshoot turrets you build...the anti-light weaponry combined with the speed also makes corvettes excellent units for wiping construction frigates...
• Corvettes can shoot strikecraft...so can flak, but the corvettes tend to be better at dealing with bombers...combined with LFs, you have a very good force for dealing with early bombers (whether it be from LCs or carrier caps)...

Specifically in regards to flak, anti-SC units take a long time to build and cost a lot relative to their power...for the early game, those are two major liabilities...

In general, you are much better with LF+Corvettes early game than you are with LRF+flak...flak and LRFs definitely have their place, but there are only a few situations in the early game where it is truly to your advantage to build such units:

• Vasari SB rush on your HW....in this case, LRMs and Kanraks are definitely your best response unit....they have great focus fire and build quickly relative to their power...
• Cap heavy fleet....again, in this case LRFs are going to be the best option for quickly driving off the caps...that being said, you'll have issues pursuing the cap if it flees, and so having LFs still is a good idea...
• Enemy comes at you with only corvettes or only LFs...in a pitched battle, building the proper counter will help you...still, you'll have problems pursuing the enemy if they jump from well to well, so even in this case having the counter may not do you a whole lot of good unless you have a single chokepoint...